Revert healtcheck on Postgres, do it in the entrypoint

docker-compose.yml

@@ -1,3 +1,4 @@
+---
 services:
   app:
     build:
@@ -11,8 +12,7 @@ services:
     volumes:
       - ./:/app/
     depends_on:
-      postgres:
-        condition: service_healthy
+      - postgres
     env_file:
       - .env
 
@@ -24,13 +24,6 @@ services:
       - 5432:5432
     env_file:
       - .env
-    # This healthcheck has a large number of retries, this is currently based on the number of
-    # retries necessary to get the database running in GitHub Actions.
-    healthcheck:
-      test: [ "CMD-SHELL", "pg_isready -U postgres -d postgres" ]
-      interval: 5s
-      timeout: 5s
-      retries: 30
 
 volumes:
   postgres_data:

entrypoint.sh

@@ -1,5 +1,16 @@
 #!/bin/sh
 
+echo "Waiting for postgres..."
+
+POSTGRES_PORT=${POSTGRES_PORT:-5432}
+POSTGRES_HOST=${POSTGRES_HOST:-localhost}
+
+while ! nc -z "$POSTGRES_HOST" "$POSTGRES_PORT"; do
+  sleep 0.1
+done
+
+echo "PostgreSQL started"
+
 # Only migrate, collectstatic and compilemessages if we are NOT in development
 if [ -z "$DEBUG" ]; then
   python src/manage.py migrate;