add linting to workflow

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

Diff for: .github/workflows/test.yml

@@ -1,6 +1,14 @@
 name: CI
 on: push
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install modules
+        run: yarn install
+      - name: Lint
+        run: yarn lint
   build-extension:
     runs-on: ubuntu-latest
     steps: