Set up CI with Azure Pipelines. (#510)

azure-pipelines.yml

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+variables:
+  GOBIN:  '$(GOPATH)/bin' # Go binaries path
+  GOROOT: '/usr/local/go1.12' # Go installation path
+  GOPATH: '$(system.defaultWorkingDirectory)/gopath' # Go workspace path
+  modulePath: '$(GOPATH)/src/github.com/$(build.repository.name)' # Path to the module's code
+
+trigger:
+  batch: "true"
+  branches:
+    include:
+    - master
+
+jobs:
+
+- job: Compile
+  strategy:
+    maxParallel: 3
+    matrix: 
+      Windows:
+        OS: windows
+      OSX:
+        OS: darwin
+      Linux:
+        OS: linux
+  steps:
+  - template: build/azure-pipelines/go-env.yaml
+  - script: "go run build/build.go -os $(OS)"
+    workingDirectory: '$(modulePath)'
+
+- job: "unittests"
+  displayName: "Run Unit Tests"
+  steps:
+  - template: build/azure-pipelines/go-env.yaml
+  - script: "go test ./..."
+    workingDirectory: '$(modulePath)'
+
+- job: "GoFmt"
+  steps:
+  - script: |
+      go fmt ./...
+      git diff
+      git diff --exit-code
+

build/azure-pipelines/go-env.yaml

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+# shared step for setting up go env
+# see https://docs.microsoft.com/en-us/azure/devops/pipelines/languages/go?view=azure-devops#build-a-container-image
+steps:
+- script: |
+    mkdir -p '$(GOBIN)'
+    mkdir -p '$(GOPATH)/pkg'
+    mkdir -p '$(modulePath)'
+    shopt -s extglob
+    mv !(gopath) '$(modulePath)'
+    echo '##vso[task.prependpath]$(GOBIN)'
+    echo '##vso[task.prependpath]$(GOROOT)/bin'
+  displayName: 'Set up the Go workspace'