Docker: wait for postgres until starting web container

docker-compose.yml

@@ -7,6 +7,12 @@ services:
       - POSTGRES_USER=postgres
       - POSTGRES_PASSWORD=postgres
       - POSTGRES_DB=postgres
+    healthcheck:
+      #CHANGE 1: this command checks if the database is ready, right on the source db server
+      test: [ "CMD-SHELL", "pg_isready" ]
+      interval: 5s
+      timeout: 5s
+      retries: 5
 
   web:
     image: registry.k0.hswaw.net/palid/spejstore:1689856372
@@ -17,7 +23,8 @@ services:
     ports:
       - "8000:8000"
     depends_on:
-      - db
+      db:
+        condition: service_healthy
     environment:
       - SPEJSTORE_CLIENT_ID
       - SPEJSTORE_SECRET