Remove Azure Pipelines CI.

Library/Homebrew/extend/os/mac/diagnostic.rb

@@ -72,7 +72,7 @@ module Homebrew
         # `brew test-bot` runs `brew doctor` in the CI for the Homebrew/brew
         # repository. This only needs to support whatever CI providers
         # Homebrew/brew is currently using.
-        return if ENV["HOMEBREW_AZURE_PIPELINES"] || ENV["HOMEBREW_GITHUB_ACTIONS"]
+        return if ENV["HOMEBREW_GITHUB_ACTIONS"]
 
         message = <<~EOS
           Your Xcode (#{MacOS::Xcode.version}) is outdated.
@@ -99,7 +99,7 @@ module Homebrew
         # `brew test-bot` runs `brew doctor` in the CI for the Homebrew/brew
         # repository. This only needs to support whatever CI providers
         # Homebrew/brew is currently using.
-        return if ENV["HOMEBREW_AZURE_PIPELINES"] || ENV["HOMEBREW_GITHUB_ACTIONS"]
+        return if ENV["HOMEBREW_GITHUB_ACTIONS"]
 
         <<~EOS
           A newer Command Line Tools release is available.

azure-pipelines.yml

@@ -1,29 +0,0 @@
-jobs:
-- job: macOS
-  pool:
-    vmImage: macOS-10.14
-  steps:
-    - bash: |
-        set -e
-        sudo xcode-select --switch /Applications/Xcode_10.2.app/Contents/Developer
-        HOMEBREW_REPOSITORY="$(brew --repo)"
-        mv "$HOMEBREW_REPOSITORY/Library/Taps" "$PWD/Library"
-        sudo rm -rf "$HOMEBREW_REPOSITORY"
-        sudo ln -s "$PWD" "$HOMEBREW_REPOSITORY"
-        brew update-reset Library/Taps/homebrew/homebrew-core
-        brew test-bot
-      displayName: Run brew test-bot
-      env:
-        HOMEBREW_GITHUB_API_TOKEN: $(github.publicApiToken)
-
-- job: Linux
-  pool:
-    vmImage: ubuntu-16.04
-  steps:
-    - bash: docker-compose -f Dockerfile.yml build sut
-      displayName: Build Docker image
-
-    - bash: docker-compose -f Dockerfile.yml run --rm -v $(Build.ArtifactStagingDirectory):/tmp/test-bot sut
-      displayName: Run brew test-bot
-      env:
-        HOMEBREW_GITHUB_API_TOKEN: $(github.publicApiToken)