feat(*): add template for portainer (#57)

public/v1/apps/portainer.json

@@ -0,0 +1,31 @@
+{
+    "captainVersion": "1",
+    "documentation": "Taken from https://hub.docker.com/r/portainer/portainer/",
+    "dockerCompose": {
+        "version": "3.3",
+        "services": {
+            "$$cap_appname": {
+                "containerHttpPort": "9000",
+                "image": "portainer/portainer:$$cap_portainer_version",
+                "volumes": [
+                    "/var/run/docker.sock:/var/run/docker.sock",
+                    "$$cap_appname-data:/data"
+                ],
+                "restart": "always"
+            }
+        }
+    },
+    "instructions": {
+        "start": "Portainer is a lightweight management UI which allows you to easily manage your Docker host or Swarm cluster. \n\n More information about this container can be found here:\n https://hub.docker.com/r/portainer/portainer/ .\n\n After installation on CapRover, it will be available as srv-captain--YOUR_CONTAINER_NAME at port 9000 to other CapRover apps .\n\nEnter your portainer Configuration parameters and click on next. It will take about a minute for the process to finish.",
+        "end": "Portainer is deployed and available as srv-captain--$$cap_appname:9000 to other apps."
+    },
+    "variables": [
+        {
+            "id": "$$cap_portainer_version",
+            "label": "Portainer Version",
+            "defaultValue": "1.20.2",
+            "description": "Checkout their docker page for the valid tags https://hub.docker.com/r/portainer/portainer/tags",
+            "validRegex": "/^([^\\s^\\/])+$/"
+        }
+    ]
+}