chore: upgrade MongoDB to v8 and implement health checks for database services with conditional startup dependencies

docker-compose.yml

@@ -2,13 +2,19 @@ version: '3.8'
 
 services:
   mongodb:
-    image: mongo:7
+    image: mongo:8
     container_name: podcastic-mongodb
     restart: unless-stopped
     volumes:
       - mongodb_data:/data/db
     networks:
       - podcastic_net
+    healthcheck:
+      test: ["CMD", "mongosh", "--eval", "db.adminCommand('ping')"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 20s
 
   redis:
     image: redis:7-alpine
@@ -18,6 +24,11 @@ services:
       - redis_data:/data
     networks:
       - podcastic_net
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
 
   app:
     build:
@@ -38,8 +49,10 @@ services:
       PODCAST_INDEX_API_KEY: ${PODCAST_INDEX_API_KEY:-}
       PODCAST_INDEX_API_SECRET: ${PODCAST_INDEX_API_SECRET:-}
     depends_on:
-      - mongodb
-      - redis
+      mongodb:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
     networks:
       - podcastic_net