Tweak GitHub Actions workflows (#2)

- Add validation job
- More consistent spacing and ordering
- Remove unnecessary release permissions

Author: csutter

.github/workflows/release.yaml

@@ -10,17 +10,17 @@ jobs:
     name: "Release to GHCR"
     if: ${{ github.ref == 'refs/heads/main' }}
     runs-on: ubuntu-latest
+
     permissions:
-      contents: write
-      pull-requests: write
       packages: write
+
     steps:
       - uses: actions/checkout@v6
 
       - name: "Publish features"
         uses: devcontainers/action@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           publish-features: "true"
           base-path-to-features: "./src"
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yaml

@@ -5,12 +5,12 @@ on:
     branches:
       - main
   pull_request:
-  workflow_dispatch:
 
 jobs:
   docs:
     name: "Ensure documentation has been generated"
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v6
 
@@ -26,12 +26,26 @@ jobs:
   shellcheck:
     name: Shellcheck
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v6
 
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@2.0.0
 
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Validate devcontainer-feature.json files
+        uses: devcontainers/action@v1
+        with:
+          validate-only: "true"
+          base-path-to-features: ./src
+
   test:
     name: "Test ${{ matrix.feature }} on ${{ matrix.baseImage }}"
     runs-on: ubuntu-latest