only run azure pipeline if a meta.yaml was added

azure-pipelines.yml

@@ -7,7 +7,13 @@ trigger:
 
 # Still allow PR builds to run against main
 pr:
-- main
+  branches:
+    include:
+    - main
+  paths:
+    include:
+    # Only run the pipelines if a meta.yaml recipe was modified.
+    - recipes/*/meta.yaml
 
 jobs:
   - template: ./.azure-pipelines/azure-pipelines-linux.yml