Remove mysql_user and update documentation (#1139)

* Remove mysql_user and update documentation

* MG, udpate based on maintainers feedback

* Remove extra comments for password, already in doc

docs/content/gettingstarted.md

@@ -31,6 +31,8 @@ In addition, the following vendors offer free trial accounts for their Eclipse h
 | MySQL |  | ✓ | ✓ |
 | RabbitMQ |  | ✓ | ✓ |
 
+HawkBit Update Server uses username=admin and password=admin as default login credentials. They can be overridden by the environment variables spring.security.user.name and spring.security.user.password which are defined in the corresponding default [application.properties](hawkbit-runtime/hawkbit-update-server/src/main/resources/application.properties).
+
 ### A: Run hawkBit Update Server as Docker Container
 
 Start the hawkBit Update Server as a single container

hawkbit-runtime/docker/docker-compose-stack.yml

@@ -79,7 +79,7 @@ services:
         condition: on-failure
     environment:
       MYSQL_DATABASE: "hawkbit"
-      MYSQL_USER: "root"
+      # MYSQL_USER: "root" is created by default in the container for mysql 5.7+
       MYSQL_ALLOW_EMPTY_PASSWORD: "true"
 
 

hawkbit-runtime/docker/docker-compose.yml

@@ -31,7 +31,7 @@ services:
     image: "mysql:5.7"
     environment:
       MYSQL_DATABASE: "hawkbit"
-      MYSQL_USER: "root"
+      # MYSQL_USER: "root" is created by default in the container for mysql 5.7+
       MYSQL_ALLOW_EMPTY_PASSWORD: "true"
     restart: always
     ports: