Run code-mirror on release branches & exclude *.md files (#4588)

Author: liliankasem

eng/ci/code-mirror.yml

@@ -10,6 +10,7 @@ trigger:
     - main
     - in-proc
     - feature/*
+    - release/*
 
 resources:
   repositories:

eng/ci/public-build.yml

@@ -12,6 +12,10 @@ pr:
     - release_4.0
     - main
     - in-proc
+  paths:
+    exclude:
+    - docs/*
+    - '**/*.md'
 
 trigger:
   batch: true
@@ -21,6 +25,10 @@ trigger:
     - main
     - in-proc
     - feature/*
+  paths:
+    exclude:
+    - docs/*
+    - '**/*.md'
 
 resources:
   repositories: