Creating Joomla template (#223)

* Creating Joomla template

* Checking prettier issue

* Changing dynamically the version of the image

* Setting a default tag to Joomla Version

public/v2/apps/joomla.json

@@ -0,0 +1,58 @@
+{
+    "captainVersion": "2",
+    "documentation": "Taken from https://hub.docker.com/_/joomla?tab=description. Based on Wordpress - No Database template.",
+    "displayName": "Joomla - No Database",
+    "description": "This will create a Joomla only. You will need to create and configure the database information manually. Intended for advanced users.",
+    "dockerCompose": {
+        "version": "3.3",
+        "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": "$$cap_db_pass"
+                }
+            }
+        }
+    },
+    "instructions": {
+        "start": "Joomla! is one of world's most popular software packages. It is used to build, organise, manage and publish content for small businesses, governments, non-profits and large organisations worldwide.\n\n Enter your Joomla Configuration parameters and click on next. A Joomla container will be created for you. The process will take about a minute for the process to finish. \n\nNote: This app is intended for advanced users who'd like to have a central DB in a single container for multiple instances. You should start by configuring your DB first and then comeback with all the DB Information.",
+        "end": "Joomla is deployed and available as $$cap_appname-joomla . \n\n IMPORTANT: It will take up to 2 minutes for Joomla to be ready. Before that, you might see a 502 error page.\n\n Remember that this app will not create a Database by itself. You need to provide all that information."
+    },
+    "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^\\/])+$/"
+        }
+    ]
+}