Continuing work

Author: ondrejmirtes

.github/workflows/phar-prefix-diff.yml

@@ -195,6 +195,63 @@ jobs:
           new_checksum=${{needs.compiler-tests.outputs.checksum}}
           [[ "$old_checksum" == "$new_checksum" ]];
 
+  phar-prefix-diff:
+    name: "PHAR Prefix Diff"
+    if: github.event_name == 'pull_request' && needs.compiler-tests.outputs.compiler_changed == 'true'
+    needs: compiler-tests
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Get base commit SHA
+        id: base
+        run: echo "base_sha=${{ github.event.pull_request.base.sha }}" >> "$GITHUB_OUTPUT"
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        working-directory: .github/scripts
+        run: npm ci
+
+      - name: "Compile TS scripts"
+        working-directory: .github/scripts
+        run: npx tsc
+
+      - name: Find phar-file-checksum from base commit
+        id: find-artifact
+        uses: actions/github-script@v7
+        env:
+          BASE_SHA: ${{ steps.base.outputs.base_sha }}
+          ARTIFACT_NAME: phar-file-checksum
+          WORKFLOW_NAME: Compile PHAR
+        with:
+          script: |
+            const script = require('./.github/scripts/dist/find-artifact.js');
+            await script({github, context, core})
+
+      # saved to phar-file-checksum/phpstan.phar
+      - name: Download old artifact by ID
+        uses: actions/download-artifact@v4
+        with:
+          artifact-ids: ${{ steps.find-artifact.outputs.artifact_id }}
+          run-id: ${{ steps.find-artifact.outputs.run_id }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      # saved to phpstan.phar
+      - name: "Download phpstan.phar"
+        uses: actions/download-artifact@v4
+        with:
+          name: phar-file-checksum
+
+      - name: "New checksum"
+        run: echo $(md5sum phpstan.phar | cut -d' ' -f1)
+
+      - name: "Old checksum"
+        run: echo $(md5sum phar-file-checksum/phpstan.phar | cut -d' ' -f1)
+
 
   commit:
     name: "Commit PHAR"