fix: provide required env vars for compose validation in CI

Author: rmdes

.github/workflows/validate.yml

@@ -16,6 +16,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Validate docker-compose.yml
+        env:
+          ORIGIN: https://example.com
+          POSTGRES_PASSWORD: ci-test-password
         run: docker compose config --quiet
 
       - name: Check nginx config syntax