Adds rstudio server (#424)

* feat(rstudio-server): adds yml for rstudio server one-click

* fix(rstudio-server): fixed version not to use latest because it could break the one-click-app

* fix: add volume to rstudio to keep persistent data and updated isOfficial value

* fix: updated description to be under 200 characters

public/v4/apps/rstudio.yml

@@ -0,0 +1,43 @@
+captainVersion: 4
+services:
+    $$cap_appname:
+        image: rocker/rstudio:$$cap_rstudio_version
+        volumes:
+            - $$cap_appname-code:/home/rstudio
+        restart: always
+        environment:
+            PASSWORD: $$cap_rstudio_password
+            USER: $$cap_rstudio_username
+        caproverExtra:
+            containerHttpPort: '8787'
+caproverOneClickApp:
+    variables:
+        - id: $$cap_rstudio_version
+          label: RStudio Version Tag
+          description: Check out their Docker page for the valid tags https://hub.docker.com/r/rocker/rstudio/tags
+          defaultValue: '4.0.4'
+          validRegex: /^([^\s^\/])+$/
+        - id: $$cap_rstudio_username
+          label: 'Username'
+          description: 'Your username to log into RStudio'
+          defaultValue: 'rstudio'
+          validRegex: /^([^\s^\/])+$/
+        - id: $$cap_rstudio_password
+          label: 'Password'
+          description: 'Your super secret Password for RStudio'
+          validRegex: /^([^\s^\/])+$/
+    instructions:
+        start: >-
+            RStudio Server enables you to provide a browser based interface to a version of R running on a remote Linux server, bringing the power and productivity of the RStudio IDE to server-based deployments of R. 
+
+            For more details, see: https://hub.docker.com/r/rocker/rstudio
+
+            Enter your RStudio Configuration parameters and click on next. It will take about a minute for the process to finish.
+        end: >-
+            Aaaand you're done! 🔥 
+            Your RStudio Server instance is available at http://$$cap_appname.$$cap_root_domain
+            Use $$cap_rstudio_username  and your super secret passwort to login to your RStudio Server instance
+    displayName: RStudio
+    isOfficial: false
+    description: RStudio Server enables you to provide a browser based interface to a version of R running on a Linux server, bringing the power & productivity of the RStudio IDE to server-based deployments of R.
+    documentation: 'Taken from https://hub.docker.com/r/rocker/rstudio'