Add release.yml file

This allows us to manage the release pipeline using version control just as we do our build pipeline. Our v2.1 and v2.2 versions require different release pipelines so it makes sense to be able to version them this way.

.editorconfig

@@ -11,6 +11,10 @@ trim_trailing_whitespace = true
 
 # (Please don't specify an indent_size here; that has too many unintended consequences.)
 
+[*.yml]
+indent_size = 2
+indent_style = space
+
 # Code files
 [*.{cs,csx,vb,vbx,h,cpp,idl}]
 indent_size = 4

azure-pipelines/release.yml

@@ -0,0 +1,88 @@
+trigger: none # We only want to trigger manually or based on resources
+pr: none
+
+resources:
+  pipelines:
+  - pipeline: CI
+    source: MessagePack-CSharp-CI
+    trigger:
+      tags:
+      - auto-release
+
+stages:
+- stage: GitHubRelease
+  displayName: GitHub Release
+  jobs:
+  - deployment: create
+    pool:
+      vmImage: ubuntu-latest
+    environment: No-Approval
+    strategy:
+      runOnce:
+        deploy:
+          steps:
+          - powershell: |
+              Write-Host "##vso[build.updatebuildnumber]$(resources.pipeline.CI.runName)"
+            displayName: Set pipeline name
+          - download: CI
+            artifact: mpc
+            displayName: 'Downloading artifact: mpc'
+          - download: CI
+            artifact: unity
+            displayName: 'Downloading artifact: unity'
+          - download: CI
+            artifact: vsix
+            displayName: 'Downloading artifact: vsix'
+          - task: ArchiveFiles@2
+            displayName: Archive mpc
+            inputs:
+              rootFolderOrFile: $(Pipeline.Workspace)/CI/mpc
+              includeRootFolder: false
+              archiveFile: $(Pipeline.Workspace)/mpc.zip
+          - task: GitHubRelease@1
+            displayName: GitHub release (create)
+            inputs:
+              gitHubConnection: AArnott github
+              repositoryName: $(Build.Repository.Name)
+              target: $(resources.pipeline.CI.sourceCommit)
+              tagSource: userSpecifiedTag
+              tag: v$(resources.pipeline.CI.runName)
+              title: v$(resources.pipeline.CI.runName)
+              assets: |
+                $(Pipeline.Workspace)/CI/unity/*.unitypackage
+                $(Pipeline.Workspace)/CI/vsix/*
+                $(Pipeline.Workspace)/mpc.zip
+              isDraft: true # After running this step, visit the new draft release, edit, and publish.
+              changeLogCompareToRelease: lastNonDraftRelease
+              changeLogType: issueBased
+              changeLogLabels: |
+                [
+                  { "label" : "bug", "displayName" : "Fixes", "state" : "closed" },
+                  { "label" : "enhancement", "displayName": "Enhancements", "state" : "closed" }
+                ]
+
+- stage: nuget_org
+  displayName: nuget.org
+  dependsOn: GitHubRelease
+  jobs:
+  - deployment: push
+    pool:
+      vmImage: ubuntu-latest
+    environment: No-Approval
+    strategy:
+      runOnce:
+        deploy:
+          steps:
+          - download: CI
+            artifact: nuget
+          - task: NuGetToolInstaller@1
+            displayName: Use NuGet 5.x
+            inputs:
+              versionSpec: 5.x
+          - task: NuGetCommand@2
+            displayName: NuGet push
+            inputs:
+              command: push
+              packagesToPush: $(Pipeline.Workspace)/CI/nuget/*.nupkg
+              nuGetFeedType: external
+              publishFeedCredentials: nuget.org (aarnott)