migrate to v4

public/v4/apps/joomla.yml

@@ -0,0 +1,51 @@
+captainVersion: 4
+services:
+  $$cap_appname-joomla:
+    image: joomla:$$cap_joomla_version
+    volumes:
+      - $$cap_appname-joomla-data:/var/www/html
+    restart: always
+    environment:
+      JOOMLA_DB_HOST: $$cap_db_host:3306
+      JOOMLA_DB_NAME: $$cap_db_name
+      JOOMLA_DB_USER: $$cap_db_user
+      JOOMLA_DB_PASSWORD: $$cap_db_pass
+caproverOneClickApp:
+  variables:
+    - description: Database Host
+      defaultValue: srv-captain--xxx
+      id: $$cap_db_host
+      label: Database Host
+    - description: Database Name
+      defaultValue: joomla
+      id: $$cap_db_name
+      label: DB Name
+    - id: $$cap_db_user
+      label: Database User
+      defaultValue: joomla
+    - id: $$cap_db_pass
+      label: Database Password
+      description: ""
+      validRegex: /.{1,}/
+    - id: $$cap_joomla_version
+      label: Joomla Version
+      defaultValue: php7.3-apache
+      description: Check out their Docker page for the valid tags https://hub.docker.com/_/joomla?tab=tags
+      validRegex: /^([^\s^\/])+$/
+  instructions:
+    start: >-
+      Joomla! is one of world's most popular software packages. It is used to build, organise, manage and publish content for small businesses, governments, non-profits and large organisations worldwide.
+
+       Enter your Joomla Configuration parameters and click on next. A Joomla container will be created for you. The process will take about a minute for the process to finish. 
+
+      Note: This app is intended for advanced users who'd like to have a central DB in a single container for multiple instances. You should start by configuring your DB first and then comeback with all the DB Information.
+    end: >-
+      Joomla is deployed and available as $$cap_appname-joomla . 
+
+       IMPORTANT: It will take up to 2 minutes for Joomla to be ready. Before that, you might see a 502 error page.
+
+       Remember that this app will not create a Database by itself. You need to provide all that information.
+  displayName: Joomla - No Database
+  isOfficial: true
+  description: This will create a Joomla only. You will need to create and configure the database information manually. Intended for advanced users.
+  documentation: Taken from https://hub.docker.com/_/joomla?tab=description. Based on Wordpress - No Database template.