Bug 1575250 - Run the check for trailing whitespaces and Windows CR in the CI r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D43360

--HG--
extra : moz-landing-system : lando

taskcluster/ci/source-test/mozlint.yml

@@ -223,6 +223,23 @@ rustfmt:
             - '**/*.rs'
 
 
+file-whitespace:
+    description: Check for trailing whitespaces and Windows CR
+    platform: lint/opt
+    treeherder:
+        symbol: file-whitespace
+    run:
+        mach: lint -l file-whitespace -f treeherder -f json:/builds/worker/mozlint.json
+    when:
+        files-changed:
+            - '**/*.c'
+            - '**/*.cc'
+            - '**/*.cpp'
+            - '**/*.h'
+            - '**/*.py'
+            - '**/*.rs'
+
+
 file-perm:
     description: Check for incorrect permissions on source files
     platform: lint/opt