fix: configure db host for act and wait for postgres

.github/workflows/python-uv-ci-with-db.yml

@@ -114,13 +114,6 @@ jobs:
           --health-interval=${{ inputs.redis_health_interval }}
           --health-timeout=${{ inputs.redis_health_timeout }}
           --health-retries=${{ inputs.redis_health_retries }}
-    env:
-      POSTGRES_HOST: 127.0.0.1
-      POSTGRES_PORT: ${{ job.services.postgres.ports['5432'] }}
-      POSTGRES_USER: ${{ inputs.postgres_user }}
-      POSTGRES_PASSWORD: ${{ inputs.postgres_password }}
-      POSTGRES_DB: ${{ inputs.postgres_db }}
-      DATABASE_URL: postgres://${{ inputs.postgres_user }}:${{ inputs.postgres_password }}@127.0.0.1:${{ job.services.postgres.ports['5432'] }}/${{ inputs.postgres_db }}
     permissions:
       contents: read
     defaults:
@@ -130,6 +123,22 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Configure DB env
+        run: |
+          if [ "${ACT:-}" = "true" ] || [ "${GITEA_ACTIONS:-}" = "true" ]; then
+            host="postgres"
+            port="5432"
+          else
+            host="127.0.0.1"
+            port="${{ job.services.postgres.ports['5432'] }}"
+          fi
+          echo "POSTGRES_HOST=$host" >> "$GITHUB_ENV"
+          echo "POSTGRES_PORT=$port" >> "$GITHUB_ENV"
+          echo "POSTGRES_USER=${{ inputs.postgres_user }}" >> "$GITHUB_ENV"
+          echo "POSTGRES_PASSWORD=${{ inputs.postgres_password }}" >> "$GITHUB_ENV"
+          echo "POSTGRES_DB=${{ inputs.postgres_db }}" >> "$GITHUB_ENV"
+          echo "DATABASE_URL=postgres://${{ inputs.postgres_user }}:${{ inputs.postgres_password }}@$host:$port/${{ inputs.postgres_db }}" >> "$GITHUB_ENV"
+
       - name: Load env vars
         if: ${{ inputs.env != '' }}
         run: |
@@ -196,6 +205,28 @@ jobs:
             echo "$line" >> "$GITHUB_ENV"
           done <<< "${{ inputs.test_env }}"
 
+      - name: Wait for postgres
+        run: |
+          python - <<'PY'
+          import os
+          import socket
+          import time
+
+          host = os.getenv("POSTGRES_HOST", "127.0.0.1")
+          port = int(os.getenv("POSTGRES_PORT", "5432"))
+          deadline = time.time() + 60
+
+          while True:
+            try:
+              with socket.create_connection((host, port), timeout=2):
+                print(f"Postgres reachable at {host}:{port}")
+                break
+            except OSError:
+              if time.time() > deadline:
+                raise
+              time.sleep(1)
+          PY
+
       - name: Run format check
         if: ${{ inputs.format_command != '' }}
         run: ${{ inputs.format_command }}