ci: add explicit wait for PostgreSQL and database creation step

- Add pg_isready wait loop to ensure PostgreSQL service is fully ready
- Run mix ecto.create explicitly before tests to prevent connection errors
- Fixes 'connection refused' errors when database service is still starting

.forgejo/workflows/build.yaml

@@ -58,6 +58,20 @@ jobs:
       - name: Install dependencies
         run: mix deps.get
 
+      - name: Wait for PostgreSQL
+        run: |
+          until pg_isready -h localhost -p 5432 -U postgres; do
+            echo "Waiting for PostgreSQL..."
+            sleep 2
+          done
+          echo "PostgreSQL is ready!"
+
+      - name: Setup database
+        run: mix ecto.create
+        env:
+          MIX_ENV: test
+          DATABASE_URL: postgresql://postgres:postgres@localhost:5432/towerops_test
+
       - name: Check code formatting
         run: mix format --check-formatted