ci: Add GitHub Actions workflow for pull request testing and validation

Author: hjmjohnson

.github/workflows/sanity_check.yml

@@ -0,0 +1,15 @@
+name: PR Test
+
+on:
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run tests
+        run: |
+          echo "Running tests on PR #${{ github.event.pull_request.number }}"
+          pytest -q

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
           df -ih
 
       - name: Run free-disk-space action (local)
-        uses: ./
+        uses: ./action.yml
         with:
           # Keep tool-cache disabled by default to avoid removing pre-cached tools
           tool-cache: "true"