backend/docker-compose: remove race condition and improve interactive dev experience

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 *.swp
 *sublime*
+backend/__postgres_testing_volume/

backend/docker-compose.pg-persist.yaml

@@ -0,0 +1,8 @@
+# Persistent postgres storage drop-in for interactive testing.
+# This drop-in will persist postgres data in $(pwd)/__postgres_testing_volume
+# across restarts of docker-compose.
+
+services:
+ postgres:
+ volumes:
+ - ./__postgres_testing_volume:/var/lib/postgresql/data

backend/docker-compose.test.yaml

@@ -1,3 +1,15 @@
+# Docker-compose file for interactive and for automated testing.
+#
+# Build docker image from local sources:
+# docker-compose --file docker-compose.test.yaml build
+#
+# Run:
+# docker-compose --file docker-compose.test.yaml run
+# Run with persistent storage:
+# docker-compose --file docker-compose.test.yaml --file docker-compose.test-db-persist.yaml up
+#
+# See docker-compose.pg-persist.yaml for more informatino on persistent storage.
+
 version: "3.9"
 
 services:
@@ -23,6 +35,10 @@ services:
  network: host
  ports:
  - "8002:8000"
+ # The "long form" depends_on silently fails in some scenarios (we've seen this with podman)
+ # so the short form is added for compatibility.
+ depends_on:
+ - postgres
  depends_on:
  postgres:
  condition: service_healthy