Added gihub action for running tests (trac plugin + noshadows script)

.github/workflows/tests.yml

@@ -0,0 +1,38 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  tracdjangoplugin:
+    runs-on: ubuntu-latest
+    container:
+      image: python:2.7.18-buster
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install requirements
+        run: pip install -r requirements.txt
+      - name: Run tests
+        run: python -m django test tracdjangoplugin.tests
+        env:
+          DJANGO_SETTINGS_MODULE: tracdjangoplugin.settings_tests
+
+  noshadows:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+      - run: pip install tinycss2
+      - run: python noshadows.py --tests