First attempt at a github action that checks django migrations

Author: mhagander

.github/workflows/check-migrations.yaml

@@ -0,0 +1,28 @@
+name: Check that migrations are up to date
+
+on: [push, pull_request]
+
+jobs:
+  check:
+
+    runs-on: debian-bookworm
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Install temporary dummy configuration
+      run: |
+        cat <<EOF > pgweb/settings_local.py
+        DATABASES = {
+            'default': {
+                'ENGINE': 'django.db.backends.dummy',
+            }
+        }
+        EOF
+    - name: Check django migrations
+      run: |
+        python3 ./manage.py makemigrations --check
+