Check in build that Sourcery generated files are up-to-date (#4035)

azure-pipelines.yml

@@ -2,6 +2,17 @@ trigger:
 - master
 
 jobs:
+- job: Sourcery
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+    - script: brew install sourcery
+      displayName: Install Sourcery
+    - script: make sourcery
+      displayName: Generate sources
+    - script: "! git diff -U0 | grep '^[-+][^-+]' | grep --invert-match '// Generated using Sourcery'"
+      displayName: Check changed files ignoring Sourcery's version
+
 - job: linux
   pool:
     vmImage: 'Ubuntu 18.04'