Use DocFX in azure pipelines

azure-pipelines.yml

@@ -1,10 +1,14 @@
-pool:
-  vmImage: 'ubuntu-latest'
-
 variables:
   GRADLE_USER_HOME: $(Pipeline.Workspace)/.gradle
 
-steps:
+jobs:
+- job: game_build
+  timeoutInMinutes: 15
+
+  pool:
+    vmImage: 'ubuntu-latest'
+
+  steps:
     - task: CacheBeta@0
       inputs:
         key: $(Agent.OS)
@@ -25,7 +29,7 @@ steps:
         gradleWrapperFile: 'gradlew'
         gradleOptions: '-Xmx3072m -Dorg.gradle.parallel=true -Dorg.gradle.caching=true -Dsonar.host.url=https://sonarcloud.io'
         javaHomeOption: 'JDKVersion'
-      jdkVersionOption: '1.8'
+        jdkVersionOption: '1.11'
         jdkArchitectureOption: 'x64'
         publishJUnitResults: true
         testResultsFiles: '**/TEST-*.xml'
@@ -45,3 +49,28 @@ steps:
       env:
         CODECOV_TOKEN: $(CODECOV_TOKEN)
       displayName: "Codecov: publish coverage"
+
+- job: docs_build
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+    - task: Gradle@2
+      displayName: "Gradle: generate API docs"
+      inputs:
+        workingDirectory: ''
+        gradleWrapperFile: 'gradlew'
+        gradleOptions: '-Xmx3072m -Dorg.gradle.parallel=true -Dorg.gradle.caching=true -Dsonar.host.url=https://sonarcloud.io'
+        javaHomeOption: 'JDKVersion'
+        jdkVersionOption: '1.11'
+        jdkArchitectureOption: 'x64'
+        tasks: 'generateApiDocs'
+    - task: CmdLine@1
+      displayName: 'Chocolatey: install DocFX'
+      inputs:
+        filename: choco
+        arguments: 'install docfx -y'
+    - task: CmdLine@1
+      displayName: 'DocFX: generate documentation'
+      inputs:
+        filename: docfx
+        arguments: docs/docfx.json