ci: add postgres health-check options, remove fragile /dev/tcp wait

.forgejo/workflows/build.yaml

@@ -29,6 +29,11 @@ jobs:
           POSTGRES_PASSWORD: postgres
         ports:
           - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
 
     steps:
       - name: Checkout code
@@ -77,20 +82,6 @@ jobs:
               mix assets.setup && \
               mix compile --warnings-as-errors'
 
-      - name: Wait for PostgreSQL
-        run: |
-          set -euo pipefail
-          for i in $(seq 1 30); do
-            if echo >/dev/tcp/localhost/5432 2>/dev/null; then
-              echo "PostgreSQL ready"
-              exit 0
-            fi
-            echo "Waiting for PostgreSQL ($i/30)..."
-            sleep 2
-          done
-          echo "PostgreSQL did not become ready" >&2
-          exit 1
-
       - name: Run tests
         run: |
           set -euo pipefail