👷 use migration files as cache key for database cache

Author: krmax44

.github/workflows/database-cache.yml

@@ -4,10 +4,26 @@ on:
   workflow_dispatch:
   schedule:
     - cron: 0 14 * * 0
+  push:
 
 jobs:
+  # check if cache key already exists, only create dump if not
+  check:
+    runs-on: ubuntu-latest
+    outputs:
+      cache_count: ${{ steps.cache_count.outputs.cache_count }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check if database cache should be created
+        id: cache_count
+        run: echo "cache_count=$(gh cache list -k "$CACHE_KEY" --json id --jq ".| length")" >> $GITHUB_OUTPUT
+        env:
+          CACHE_KEY: db-${{ runner.os }}-${{ hashFiles('**/migrations/*.py') }}
+
   dump:
     runs-on: ubuntu-latest
+    needs: check
+    if: needs.check.outputs.cache_count == '0'
     steps:
       - uses: actions/checkout@v4
       - name: Start database
@@ -24,9 +40,9 @@ jobs:
       - name: Run migrations
         run: python manage.py migrate --skip-checks # due to django-cms issue
       - name: Create database dump
-        run: docker compose -f compose-dev.yaml exec db pg_dump -U fragdenstaat_de fragdenstaat_de | gzip > dump.gz
+        run: docker compose -f compose-dev.yaml exec db pg_dump -U fragdenstaat_de fragdenstaat_de | gzip > cache-dump.sql
       - name: Save dump
         uses: actions/cache/save@v5
         with:
-          path: dump.gz
-          key: ${{ runner.os }}-${{ hashFiles('compose-dev.yaml') }}
+          path: cache-dump.sql
+          key: db-${{ runner.os }}-${{ hashFiles('**/migrations/*.py') }}