ci: only test packages with changed files on PRs (#41)

* ci: only test packages with changed files on PRs

* ci: add pull-requests read permission for paths-filter

.github/workflows/ci.yml

@@ -23,7 +23,36 @@ jobs:
       - run: uv sync --all-packages
       - uses: j178/prek-action@v2
 
+  changes:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+    outputs:
+      packages: ${{ steps.filter.outputs.changes }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            codeflash-core:
+              - 'packages/codeflash-core/**'
+            codeflash-python:
+              - 'packages/codeflash-core/**'
+              - 'packages/codeflash-python/**'
+            codeflash-api:
+              - 'packages/codeflash-api/**'
+            blackbox:
+              - 'packages/blackbox/**'
+            github-app:
+              - 'packages/github-app/**'
+
   test:
+    needs: changes
+    if: >-
+      github.event_name == 'push'
+      || needs.changes.outputs.packages != '[]'
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -34,8 +63,18 @@ jobs:
           python-version: "3.12"
           enable-cache: true
       - run: uv sync --all-packages
-      - name: Test
-        run: uv run pytest packages/ -v
+      - name: Test changed packages
+        run: |
+          if [ "${{ github.event_name }}" = "push" ]; then
+            uv run pytest packages/ -v
+          else
+            CHANGED='${{ needs.changes.outputs.packages }}'
+            for pkg in $(echo "$CHANGED" | jq -r '.[]'); do
+              echo "::group::Testing $pkg"
+              uv run pytest "packages/$pkg" -v
+              echo "::endgroup::"
+            done
+          fi
         env:
           CI: "true"