actions: test that generated code is consistent

.github/workflows/main.yml

@@ -183,6 +183,67 @@ jobs:
       - name: Run integration tests
         run: ./tests/travis.sh -t4
 
+  codegen:
+    name: Generated Code consistency checks
+    needs: build-php
+    runs-on: ${{ matrix.image }}
+    strategy:
+      fail-fast: false
+      matrix:
+        image: [ubuntu-20.04]
+        php: [8.0.9]
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Restore PHP build cache
+        id: php-build-cache
+        uses: actions/cache@v2
+        with:
+          path: "./bin"
+          key: "php-build-generic-${{ matrix.php }}-${{ matrix.image }}-${{ hashFiles('./tests/gh-actions/build.sh') }}"
+
+      - name: Kill build on PHP build cache miss (should never happen)
+        if: steps.php-build-cache.outputs.cache-hit != 'true'
+        run: exit 1
+
+      - name: Install cached PHP's dependencies
+        if: steps.php-build-cache.outputs.cache-hit == 'true'
+        run: ./tests/gh-actions/install-dependencies.sh
+
+      - name: Prefix PHP to PATH
+        run: echo "$(pwd)/bin/php7/bin" >> $GITHUB_PATH
+
+      - name: Install Composer
+        run: curl -sS https://getcomposer.org/installer | php
+
+      - name: Restore Composer package cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cache/composer/files
+            ~/.cache/composer/vcs
+          key: "composer-v2-cache-${{ matrix.php }}-${{ hashFiles('./composer.lock') }}"
+          restore-keys: |
+            composer-v2-cache-
+
+      - name: Install Composer dependencies
+        run: php composer.phar install --no-dev --prefer-dist --no-interaction
+
+      - name: Regenerate registry annotations
+        run: php build/generate-registry-annotations.php src
+
+      - name: Regenerate KnownTranslation APIs
+        run: php build/generate-known-translation-apis.php
+
+      - name: Run git diff
+        run: git diff
+
+      - name: Fail job if changes were made
+        run: git diff --quiet
+
   codestyle:
     name: Code Style checks
     runs-on: ubuntu-20.04