fix(MAT-273): add dummy env vars to CI so bot.py can be imported in tests

test_needs_query_rewrite imports Bot from bot.py which reads
MATRIX_HOMESERVER etc. at module level — KeyError in CI where those
vars are not set. This has blocked all deploys since c2985488.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -17,5 +17,12 @@ jobs:
         run: |
           pip install -r requirements.txt -r requirements-test.txt
       - name: Run tests
+        env:
+          MATRIX_HOMESERVER: https://test.local
+          MATRIX_BOT_USER: "@test:test.local"
+          MATRIX_BOT_PASSWORD: test
+          LIVEKIT_URL: wss://test.local
+          LIVEKIT_API_KEY: test
+          LIVEKIT_API_SECRET: test
         run: |
           pytest tests/ -v --cov=device_trust --cov-report=term