Add reusable line endings check workflow (#2246)

* Add reusable line endings check workflow

* Add default text=auto eol=lf to .gitattributes

* Pin reusable workflow to commit SHA

Author: michelle-clayton-work

.gitattributes

@@ -1,3 +1,6 @@
+# Default: normalize text files to LF in the repo and on checkout.
+* text=auto eol=lf
+
 # On Windows, running "git apply" with CRLF patch files causes an error for binary files:
 # "git diff header lacks filename information when removing 1 leading pathname component".
 # To fix this, always check out patch files as LF.

.github/workflows/check-line-endings.yml

@@ -0,0 +1,16 @@
+name: Check Line Endings
+
+on:
+  push:
+    branches:
+      - "microsoft/*"
+  pull_request:
+    branches:
+      - "microsoft/*"
+
+permissions:
+  contents: read
+
+jobs:
+  check-line-endings:
+    uses: microsoft/go-infra/.github/workflows/check-line-endings.yml@944d1d054c1265bf35b6632d42682217330907c4 # main