Prevent generated build files from showing diffs in pull requests

Author: alcaeus

.gitattributes

@@ -14,3 +14,9 @@ phpunit.evergreen.xml export-ignore
 phpunit.xml.dist export-ignore
 psalm.xml.dist export-ignore
 psalm-baseline.xml export-ignore
+
+# Prevent generated build files from showing diffs in pull requests
+.evergreen/config/build/*.yml linguist-generated=true
+.evergreen/config/build/_template*.yml linguist-generated=false
+.evergreen/config/test/*.yml linguist-generated=true
+.evergreen/config/test/_template*.yml linguist-generated=false