Enable appveyor RDP with env variable

.appveyor.yml

@@ -52,8 +52,12 @@ init:
         https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
         Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
           throw "There are newer queued builds for this pull request, failing early." }
-  # Enable RDP
-  - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+  # Enable RDP if environment variable is set (https://ci.appveyor.com/project/h3llrais3r/auto-subliminal/settings/environment)
+  - ps: |
+      if ($env:APPVEYOR_RDP -eq 'TRUE') {
+        Add-AppveyorMessage "Start remote desktop connection"
+        iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+      }
 
 # Command(s) to install dependencies
 install:
@@ -74,7 +78,7 @@ install:
   # Install npm dependencies
   - npm install
 
-# Build command(s)
+# Test command(s)
 before_test:
   - npm run eslint
   - npm run stylelint
@@ -83,6 +87,10 @@ test_script:
   - coverage run setup.py test
   - coverage report
 
-# Block RDP on failure
-on_failure:
-  - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+# On finish command(s)
+on_finish:
+  - ps: |
+      if ($env:APPVEYOR_RDP -eq 'TRUE') {
+        Add-AppveyorMessage "Stop remote desktop connection"
+        $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+      }