[NEW] Mercure one-click template (#592)

* [NEW] Mercure one-click template

* fixing file format check

Co-authored-by: Fernando Garioli <desenvolvimento5@arcoinformatica.com.br>

public/v4/apps/mercure.yml

@@ -0,0 +1,51 @@
+captainVersion: 4
+services:
+    # Mercure
+    $$cap_appname:
+        image: dunglas/mercure:$$cap_mercure_version
+        restart: unless-stopped
+        environment:
+            # Uncomment the following line to disable HTTPS
+            SERVER_NAME: ':80'
+            MERCURE_PUBLISHER_JWT_KEY: $$cap_mercure_publisher_jwt_key
+            MERCURE_SUBSCRIBER_JWT_KEY: $$cap_mercure_subscriber_jwt_key
+            MERCURE_EXTRA_DIRECTIVES: $$cap_mercure_extra_directives
+        volumes:
+            - $$cap_appname-mercure-data:/data
+            - $$cap_appname-mercure-config:/config
+        # Uncomment the following line to enable the development mode
+        caproverExtra:
+            containerHttpPort: '80'
+caproverOneClickApp:
+    variables:
+        - id: $$cap_mercure_version
+          label: Mercure Version
+          defaultValue: 'v0.13'
+          description: Check out their Docker page for the valid tags https://hub.docker.com/r/dunglas/mercure/tags
+          validRegex: /^([^\s^\/])+$/
+        - id: $$cap_mercure_publisher_jwt_key
+          label: Mercure Publisher JWT Key
+          defaultValue: '!ChangeMe!'
+          description: 'The JWT key to use for publishers'
+        - id: $$cap_mercure_subscriber_jwt_key
+          label: Mercure Subscriber JWT Key
+          defaultValue: '!ChangeMe!'
+          description: 'The JWT key to use for subscribers'
+        - id: $$cap_mercure_extra_directives
+          label: Extra Directives
+          defaultValue: 'subscriptions demo anonymous cors_origins * publish_origins *'
+          description: 'A list of extra Mercure directives inject in the Caddy file, one per line'
+    instructions:
+        start: >-
+            Mercure is a protocol allowing to push data updates to web browsers and other HTTP clients in a convenient, fast, reliable and battery-efficient way. It is especially useful to publish real-time updates of resources served through web APIs, to reactive web and mobile apps.
+
+            For documentation, see: https://mercure.rocks/docs
+
+            Enter your Mercure Configuration parameters and click on next. It will take about a minute for the process to finish.
+        end: >-
+            Aaaand you're done! 😄
+            Your service is available at http://$$cap_appname.$$cap_root_domain
+    displayName: 'Mercure'
+    isOfficial: true
+    description: Mercure is a protocol allowing to push data updates to web browsers and other HTTP clients.
+    documentation: Taken from https://mercure.rocks/docs/hub/install