fix: remove --frozen flag from uv run for lowest-direct resolution

The --frozen flag should only be used with the highest resolution strategy
(which uses the lockfile). The lowest-direct resolution strategy needs to
resolve dependencies dynamically, so it cannot use --frozen.

This change adds a run-flags field to the matrix to conditionally apply
--frozen only to the highest resolution strategy, allowing lowest-direct
tests to run without the incompatible --frozen flag.

Github-Issue: #1325

Author: felixweinberger

.github/workflows/shared.yml

@@ -40,8 +40,10 @@ jobs:
         dep-resolution:
           - name: lowest-direct
             install-flags: "--resolution lowest-direct"
+            run-flags: ""
           - name: highest
             install-flags: "--frozen"
+            run-flags: "--frozen"
         os: [ubuntu-latest, windows-latest]
 
     steps:
@@ -57,7 +59,7 @@ jobs:
         run: uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}
 
       - name: Run pytest
-        run: uv run --frozen --no-sync pytest
+        run: uv run ${{ matrix.dep-resolution.run-flags }} --no-sync pytest
 
   readme-snippets:
     runs-on: ubuntu-latest