Change DB backend to mysql for nextcloud.

nextcloud/docker-compose.yaml

@@ -38,10 +38,10 @@ services:
     networks:
       - nextcloud
     environment:
-      POSTGRES_PASSWORD: ${DB_PASS}
+      MYSQL_PASSWORD: ${DB_PASS}
       POSTGRES_USER: ${DB_USER}
-      POSTGRES_DB: ${DB_NAME}
-      POSTGRES_HOST: db:5432
+      MYSQL_USER: ${DB_NAME}
+      MYSQL_HOST: db:3306
       REDIS_HOST: redis
       NEXTCLOUD_ADMIN_USER: ${NEXTCLOUD_ADMIN_USER}
       NEXTCLOUD_ADMIN_PASSWORD: ${NEXTCLOUD_ADMIN_PASS}
@@ -79,18 +79,17 @@ services:
       - ${PWD}/nextcloud.conf:/etc/nginx/conf.d/default.conf
 
   db:
-    image: postgres:14-alpine
+    image: mysql:latest
     restart: unless-stopped
     volumes:
       - nextcloud-db:/var/lib/postgresql/data
     networks:
       - nextcloud
     environment:
-      POSTGRES_PASSWORD: ${DB_PASS}
-      POSTGRES_USER: ${DB_USER}
-      POSTGRES_DB: ${DB_NAME}
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U $DB_USER"]
+      MYSQL_ROOT_PASSWORD: ${DB_PASS}
+      MYSQL_PASSWORD: ${DB_PASS}
+      MYSQL_USER: ${DB_USER}
+      MYSQL_DATABASE: ${DB_NAME}
 
   redis:
     image: redis:alpine