Skip build/test CI for PRs with only doc changes (open-telemetry#1173)

Author: jeffreyc-splunk

.github/workflows/build-and-test.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - main
   pull_request:
+    paths-ignore:
+      - '**/*.md'
 
 concurrency:
   group: build-and-test-${{ github.event.pull_request.number || github.ref }}

.github/workflows/windows-test.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - main
   pull_request:
+    paths-ignore:
+      - '**/*.md'
 
 concurrency:
   group: windows-test-${{ github.event.pull_request.number || github.ref }}