Adding checkmk to One-Click-Apps (#900)

* adding checkmk to One-Click-Apps

* removed unnecessary environment variables

public/v4/apps/checkmk.yml

@@ -0,0 +1,30 @@
+captainVersion: 4
+services:
+    '$$cap_appname':
+        image: checkmk/check-mk-raw:$$cap_version
+        volumes:
+            - '$$cap_appname-data:/omd/sites'
+            - /etc/localtime:/etc/localtime
+        ports:
+            - 8000:8000
+        caproverExtra:
+            containerHttpPort: '5000'
+caproverOneClickApp:
+    variables:
+        - id: '$$cap_version'
+          label: CheckMK Version
+          defaultValue: '2023.04.07'
+          description: Check out their Docker page for the valid tags https://hub.docker.com/r/checkmk/check-mk-raw/tags
+          validRegex: "/^([^\\s^\\/])+$/"
+    instructions:
+        start: |-
+            Checkmk is a leading IT monitoring software. Easy configuration, scalable, flexible.
+            Open source and enterprise. Ready to go in minutes.
+            More details: https://checkmk.com/
+        end: |-
+            !!IMPORTEND!! Your username is 'cmkadmin' and your password is generated during the container initialization and is written in the logs.
+            CheckMK has been successfully deployed!
+    displayName: CheckMK RAW
+    isOfficial: true
+    description: Quickly gain a complete view of your IT infrastructure, no matter how complex. Checkmk provides powerful monitoring of networks, servers, clouds, containers and applications. Fast. Effective.
+    documentation: See https://docs.checkmk.com/latest/