Add Elixir CI workflow configuration #1

noahd1 · 2025-12-24T19:37:52Z

No description provided.

qltysh · 2025-12-24T19:38:51Z

All good ✅

.github/workflows/elixir.yml

Copilot

Pull request overview

This PR adds a GitHub Actions workflow configuration to enable continuous integration for an Elixir project. The workflow automatically runs on pushes and pull requests to the main branch.

Adds automated build and test execution using GitHub Actions
Configures dependency caching to improve CI performance
Sets up Elixir 1.15.2 with OTP 26.0 using the erlef/setup-beam action

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Copilot · 2025-12-24T19:39:53Z

.github/workflows/elixir.yml

+    - name: Restore dependencies cache
+      uses: actions/cache@v3
+      with:
+        path: deps


The cache configuration is incomplete. It only caches the deps directory, but Elixir projects should also cache the _build directory to avoid recompiling dependencies on every run. Add _build to the path to improve CI performance. The path should be multi-line with both deps and _build listed.

Suggested change

path: deps

path: |

deps

_build

Copilot · 2025-12-24T19:39:53Z

.github/workflows/elixir.yml

+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+        restore-keys: ${{ runner.os }}-mix-


The cache key only includes the mix.lock hash, but not the Elixir/OTP versions. This means that if you change Elixir or OTP versions in the workflow, the cached dependencies compiled for the old versions will be reused, potentially causing compilation errors or runtime issues. Consider updating the key to include version information, for example: ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('**/mix.lock') }} or a similar pattern if not using a matrix strategy.

Suggested change

key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}

restore-keys: ${{ runner.os }}-mix-

key: ${{ runner.os }}-mix-1.15.2-26.0-${{ hashFiles('**/mix.lock') }}

restore-keys: ${{ runner.os }}-mix-1.15.2-26.0-

Copilot · 2025-12-24T19:39:53Z

.github/workflows/elixir.yml

+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+        restore-keys: ${{ runner.os }}-mix-
+    - name: Install dependencies
+      run: mix deps.get


The workflow is missing important code quality checks that are standard for Elixir projects. Consider adding steps to run mix compile --warnings-as-errors (to catch compilation warnings), mix format --check-formatted (to verify code formatting since .formatter.exs exists in the project), and potentially mix credo or mix dialyzer if those tools are added to the project. These checks help maintain code quality and catch issues early.

Suggested change

run: mix deps.get

run: mix deps.get

- name: Compile (warnings as errors)

run: mix compile --warnings-as-errors

- name: Check formatting

run: mix format --check-formatted

Copilot · 2025-12-24T19:39:53Z

.github/workflows/elixir.yml

+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+        restore-keys: ${{ runner.os }}-mix-
+    - name: Install dependencies
+      run: mix deps.get


The workflow runs mix test immediately after installing dependencies, without an explicit compilation step. While mix test will compile the code automatically, adding an explicit mix compile step before running tests would make build failures clearer and separate compilation issues from test failures in the CI logs. This is particularly helpful when debugging CI failures.

Suggested change

run: mix deps.get

run: mix deps.get

- name: Compile

run: mix compile

Copilot · 2025-12-24T19:39:54Z

.github/workflows/elixir.yml

+    - name: Set up Elixir
+      uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21 # v1.16.0
+      with:
+        elixir-version: '1.15.2' # [Required] Define the Elixir version


The Elixir version specified here (1.15.2) is incompatible with the project's requirements. The mix.exs file specifies elixir: "~> 1.19", which requires Elixir version 1.19.0 or higher. This mismatch will cause the CI build to fail when running mix commands. Update the elixir-version to '1.19' or a later version that satisfies the project requirements.

Suggested change

elixir-version: '1.15.2' # [Required] Define the Elixir version

elixir-version: '1.19' # [Required] Define the Elixir version

Copilot · 2025-12-24T19:39:54Z

.github/workflows/elixir.yml

+        elixir-version: '1.15.2' # [Required] Define the Elixir version
+        otp-version: '26.0'      # [Required] Define the Erlang/OTP version
+    - name: Restore dependencies cache
+      uses: actions/cache@v3


The actions/cache action is using v3, but v4 is the latest version available. Using v4 provides better performance, improved caching reliability, and compatibility with the latest GitHub Actions features. Consider updating to actions/cache@v4 to benefit from these improvements.

Suggested change

uses: actions/cache@v3

uses: actions/cache@v4

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Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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Copilot · 2025-12-24T19:47:44Z

.github/workflows/elixir.yml

+      uses: actions/cache@v3
+      with:
+        path: deps
+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}


The cache key should also include the Elixir and OTP versions to prevent using cached artifacts built with different versions. Update the key to: 'key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}-${{ matrix.elixir }}-${{ matrix.otp }}' (or use the specific versions if not using a matrix).

Suggested change

key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}

key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}-elixir-1.17.3-otp-26.2.5

Copilot · 2025-12-24T19:47:44Z

.github/workflows/elixir.yml

+        elixir-version: '1.17.3'
+        otp-version: '26.2.5'
+    - name: Restore dependencies cache
+      uses: actions/cache@v3


Using actions/cache@v3 is outdated. The workflow already uses actions/checkout@v4, so for consistency and to benefit from the latest improvements, consider updating this to actions/cache@v4.

Suggested change

uses: actions/cache@v3

uses: actions/cache@v4

qltysh · 2025-12-24T19:50:20Z

Total Coverage: Coverage tags mismatch: head has [] but base only has []

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Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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Copilot · 2025-12-24T19:55:28Z

.github/workflows/elixir.yml

+    - name: Set up Elixir
+      uses: erlef/setup-beam@v1
+      with:
+        elixir-version: '1.17.3'


The Elixir version 1.17.3 specified here is incompatible with the version constraint in mix.exs (line 8), which specifies "~~> 1.15". The "~~>" operator means >= 1.15.0 and < 1.16.0, so Elixir 1.17.3 will not satisfy this constraint. This will cause the CI build to fail or produce misleading results since it's testing with a version outside the declared compatibility range. Either update the CI to use a 1.15.x version or update mix.exs to support 1.17.x (e.g., "~~> 1.15" should be changed to "~~> 1.15 or ~> 1.17" or use a range like ">= 1.15.0").

Suggested change

elixir-version: '1.17.3'

elixir-version: '1.15.7'

Add Elixir CI workflow configuration

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Copilot AI review requested due to automatic review settings December 24, 2025 19:37

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noahd1 added 2 commits December 24, 2025 11:43

CI Changes

015b1f1

CI Changes

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Copilot AI review requested due to automatic review settings December 24, 2025 19:45

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Add write permissions

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Remove cache

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Copilot AI review requested due to automatic review settings December 24, 2025 19:53

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noahd1 merged commit 73b8a36 into main Dec 24, 2025
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		key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
		restore-keys: ${{ runner.os }}-mix-

-      run: mix deps.get
+      run: mix deps.get
+    - name: Compile (warnings as errors)
+      run: mix compile --warnings-as-errors
+    - name: Check formatting
+      run: mix format --check-formatted

	elixir-version: '1.15.2' # [Required] Define the Elixir version
	elixir-version: '1.19' # [Required] Define the Elixir version

Add Elixir CI workflow configuration #1

Add Elixir CI workflow configuration #1

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