Add PR check

.github/workflows/__language-aliases.yml

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+# Warning: This file is generated automatically, and should not be modified.
+# Instead, please modify the template in the pr-checks directory and run:
+#     (cd pr-checks; pip install ruamel.yaml@0.17.31 && python3 sync.py)
+# to regenerate this file.
+
+name: PR Check - Language aliases
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  GO111MODULE: auto
+  CODEQL_EXTRACTOR_JAVA_AGENT_DISABLE_KOTLIN: 'true'
+on:
+  push:
+    branches:
+    - main
+    - releases/v2
+  pull_request:
+    types:
+    - opened
+    - synchronize
+    - reopened
+    - ready_for_review
+  workflow_dispatch: {}
+jobs:
+  language-aliases:
+    strategy:
+      matrix:
+        include:
+        - os: ubuntu-latest
+          version: latest
+    name: Language aliases
+    permissions:
+      contents: read
+      security-events: write
+    timeout-minutes: 45
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+    - name: Prepare test
+      id: prepare-test
+      uses: ./.github/actions/prepare-test
+      with:
+        version: ${{ matrix.version }}
+        use-all-platform-bundle: 'false'
+    - name: Set environment variable for Swift enablement
+      if: >-
+        runner.os != 'Windows' && (
+            matrix.version == '20220908' ||
+            matrix.version == '20221211'
+        )
+      shell: bash
+      run: echo "CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT=true" >> $GITHUB_ENV
+    - uses: ./../action/init
+      with:
+        languages: C#,java-kotlin,swift,typescript
+        tools: ${{ steps.prepare-test.outputs.tools-url }}
+
+    - name: Check languages
+      run: |
+        expected_languages="csharp,java,swift,javascript"
+        actual_languages=$(jq -r '.languages | join(",")' "$RUNNER_TEMP"/config)
+
+        if [ "$expected_languages" != "$actual_languages" ]; then
+          echo "Resolved languages did not match expected list. " \
+            "Expected languages: $expected_languages. Actual languages: $actual_languages."
+          exit 1
+        fi
+    env:
+      CODEQL_ACTION_TEST_MODE: true

pr-checks/checks/language-aliases.yml

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+name: "Language aliases"
+description: "Tests that ML-powered queries are run with the security-extended suite and that they produce alerts on a test DB"
+versions: ["latest"]
+operatingSystems: ["ubuntu"]
+steps:
+  - uses: ./../action/init
+    with:
+      languages: C#,java-kotlin,swift,typescript
+      tools: ${{ steps.prepare-test.outputs.tools-url }}
+
+  - name: "Check languages"
+    run: |
+      expected_languages="csharp,java,swift,javascript"
+      actual_languages=$(jq -r '.languages | join(",")' "$RUNNER_TEMP"/config)
+
+      if [ "$expected_languages" != "$actual_languages" ]; then
+        echo "Resolved languages did not match expected list. " \
+          "Expected languages: $expected_languages. Actual languages: $actual_languages."
+        exit 1
+      fi