[Azure Devops] Deploy Pipeline

* trigger: all branch
* Build (no condition)
* Deploy to EnvA (condition: branch: `main`)
* Deploy to EnvB (condition: branch: `main`)
* Deploy to EnvC (condition: branch: `main`)

trigger:
  branches:
    include:
      - "*"

pool:
  vmImage: ubuntu-latest

stages:
  - stage: "Build"
    jobs:
          - script: dotnet publish ./src/Foo/Foo.csproj -o ./publish
            displayName: "dotnet publish"

          - task: ArchiveFiles@2
            inputs:
              includeRootFolder: false
              rootFolderOrFile: "./publish"
              archiveFile: "$(Build.ArtifactStagingDirectory)/Foo.zip"

          - publish: "$(Build.ArtifactStagingDirectory)"
            artifact: "Drop"
  - stage: "Stage_A"
    condition: and(succeeded(), eq(variables['build.sourceBranch'], 'refs/heads/main'))
    jobs:
      - deployment: "Deploy_A"
        displayName: "Deploy to A"
        environment: "A"
        variables:
          X: 1
        strategy:
          runOnce:
            deploy:
              steps:
                - script: echo 'bla $(X)'
  - stage: "Stage_B"
    condition: and(succeeded(), eq(variables['build.sourceBranch'], 'refs/heads/main'))
    jobs:
      - deployment: "Deploy_B"
        displayName: "Deploy to B"
        environment: "B"
        variables:
          X: 2
        strategy:
          runOnce:
            deploy:
              steps:
                - script: echo 'bla $(X)'
  - stage: "Stage_C"
    condition: and(succeeded(), eq(variables['build.sourceBranch'], 'refs/heads/main'))
    jobs:
      - deployment: "Deploy_C"
        displayName: "Deploy to C"
        environment: "C"
        variables:
          X: 3
        strategy:
          runOnce:
            deploy:
              steps:
                - script: echo 'bla $(X)'