Allow local instead of downloaded CodeQL

.github/workflows/pr-checks.yml

@@ -242,6 +242,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       versions: ${{ steps.compare.outputs.versions }}
+      nightly-url: ${{ steps.get-url.outputs.nightly-url }}
 
     steps:
     - uses: actions/checkout@v2
@@ -827,3 +828,23 @@ jobs:
         # Deliberately don't use TEST_MODE here. This is specifically testing
         # the compatibility with the API.
         runner/dist/codeql-runner-linux upload --sarif-file src/testdata/empty-sarif.sarif --repository $GITHUB_REPOSITORY --commit $GITHUB_SHA --ref $GITHUB_REF --github-url $GITHUB_SERVER_URL --github-auth ${{ github.token }}
+
+  multi-language-repo_test-local-codeql:
+    needs: [check-js, check-node-modules]
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Move codeql-action
+      run: |
+        wget ${{ fromJson(needs.check-codeql-versions.outputs.nightly-url) }}
+        mkdir ../action
+        mv * .github ../action/
+        mv ../action/tests/multi-language-repo/{*,.github} .
+        mv ../action/.github/workflows .github
+    - uses: ./../action/init
+      with:
+        tools: "file://../action/codeql-bundle.tar.gz"
+    - name: Build code
+      run: ./build.sh
+    - uses: ./../action/analyze