Set ALLOW_EMPTY_PASSWORD env var for mariadb image

bitnami/ghost/0/docker-compose.yml

@@ -2,6 +2,8 @@ version: '2'
 services:
   mariadb:
     image: 'bitnami/mariadb:latest'
+    environment:
+      - ALLOW_EMPTY_PASSWORD=yes
     volumes:
       - 'mariadb_data:/bitnami/mariadb'
   ghost:

bitnami/ghost/README.md

@@ -30,6 +30,8 @@ version: '2'
 services:
   mariadb:
     image: 'bitnami/mariadb:latest'
+    environment:
+      - ALLOW_EMPTY_PASSWORD=yes
     volumes:
        - 'mariadb_data:/bitnami/mariadb'
   ghost:
@@ -60,7 +62,7 @@ If you want to run the application manually instead of using docker-compose, the
 2. Start a MariaDB database in the network generated:
 
    ```bash
-   $ docker run -d --name mariadb --net=ghost-tier bitnami/mariadb
+   $ docker run -d --name mariadb -e ALLOW_EMPTY_PASSWORD=yes --net=ghost-tier bitnami/mariadb
    ```
 
    *Note:* You need to give the container a name in order to Ghost to resolve the host
@@ -95,6 +97,8 @@ version: '2'
 services:
   mariadb:
     image: 'bitnami/mariadb:latest'
+    environment:
+      - ALLOW_EMPTY_PASSWORD=yes
     volumes:
       - /path/to/mariadb-persistence:/bitnami/mariadb
   ghost:
@@ -120,7 +124,7 @@ In this case you need to specify the directories to mount on the run command. Th
 2. Create a MariaDB container with host volume:
 
   ```bash
-  $ docker run -d --name mariadb \
+  $ docker run -d --name mariadb -e ALLOW_EMPTY_PASSWORD=yes \
     --net ghost-tier \
     --volume /path/to/mariadb-persistence:/bitnami/mariadb \
     bitnami/mariadb:latest

bitnami/ghost/docker-compose.yml

@@ -2,6 +2,8 @@ version: '2'
 services:
   mariadb:
     image: 'bitnami/mariadb:latest'
+    environment:
+      - ALLOW_EMPTY_PASSWORD=yes
     volumes:
       - 'mariadb_data:/bitnami/mariadb'
   ghost: