ci: create docker push only workflow

and change default behaviour: deploy when tag is created instead

dev.docker-compose.yml

@@ -1,25 +1,27 @@
-version: '3.8'
-
 services:
-  mariadb:
-    container_name: mariadb
+  mysqldb:
     image: mysql:latest
     restart: always
     env_file:
       - .env
     ports:
       - '3306:3306'
+    healthcheck:
+      test: mysqladmin ping -h 127.0.0.1 -u $$MYSQL_USER --password=$$MYSQL_PASSWORD
+      start_period: 5s
+      interval: 5s
+      timeout: 5s
+      retries: 55
 
   phpmyadmin:
     image: phpmyadmin:5
-    container_name: phpmyadmin
     restart: always
     environment:
-      - PMA_HOST=mariadb
+      - PMA_HOST=mysqldb
       - PMA_PORT=3306
     env_file:
       - .env
     ports:
       - '8080:80'
     depends_on:
-      - mariadb
+      - mysqldb