added release job to azure [skip ci]

Author: JohnstonCode

build.yml

@@ -121,5 +121,38 @@ jobs:
           command: custom
           verbose: false
           customCommand: 'run test --silent'
+        env:
+          DISPLAY: :10
+  - job: Release
+    condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'))
+    pool:
+      name: Hosted Ubuntu 1604
+      demands: npm
+    steps:
+      - task: NodeTool@0
+        displayName: 'Use Node 8.x'
+        inputs:
+          versionSpec: 8.x
+      - task: Npm@1
+        displayName: 'Install dependencies'
+        inputs:
+          verbose: false
+      - task: Npm@1
+        displayName: 'Compile sources'
+        inputs:
+          command: custom
+          verbose: false
+          customCommand: 'run build'
+      - script: |
+          set -e
+          /usr/bin/Xvfb :10 -ac >> /tmp/Xvfb.out 2>&1 &
+          disown -ar
+        displayName: 'Start xvfb'
+      - task: Npm@1
+        displayName: 'Run semantic-release'
+        inputs:
+          command: custom
+          verbose: false
+          customCommand: 'run semantic-release'
         env:
           DISPLAY: :10