[CI] Install apt dependencies when running "pyright: Run test cases" (#13976)

.github/workflows/tests.yml

@@ -103,6 +103,13 @@ jobs:
       - name: Install typeshed test-suite requirements
         # Install these so we can run `get_external_stub_requirements.py`
         run: uv pip install -r requirements-tests.txt --system
+      - name: Install required APT packages
+        run: |
+          DEPENDENCIES=$( python tests/get_external_apt_dependencies.py )
+          if [ -n "$DEPENDENCIES" ]; then
+              printf "Installing APT packages:\n  $(echo $DEPENDENCIES | sed 's/ /\n  /g')\n"
+              sudo apt-get install -qy $DEPENDENCIES
+          fi
       - name: Create an isolated venv for testing
         run: uv venv .venv
       - name: Install 3rd-party stub dependencies

tests/get_external_apt_dependencies.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import itertools
+import os
+import sys
+
+from ts_utils.metadata import read_metadata
+from ts_utils.paths import STUBS_PATH
+
+if __name__ == "__main__":
+    distributions = sys.argv[1:]
+    if not distributions:
+        distributions = os.listdir(STUBS_PATH)
+    dependencies = set(
+        itertools.chain.from_iterable(
+            read_metadata(distribution).stubtest_settings.apt_dependencies for distribution in distributions
+        )
+    )
+    for dependency in sorted(dependencies):
+        print(dependency)