Don't run jobs on draft PRs

.github/workflows/pull-request.yaml

@@ -5,10 +5,20 @@ on:
     branches:
       - '!master'
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
 
 jobs:
   lint:
+    if: 'github.event.pull_request.draft == false'
     uses: ./.github/workflows/lint.yaml
 
   bundlesize:
+    if: 'github.event.pull_request.draft == false'
     uses: ./.github/workflows/bundlesize.yaml
+
+  fail_if_pull_request_is_draft:
+    if: github.event.pull_request.draft == true
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Fails in order to indicate that pull request needs to be marked as ready to review and unit tests workflow needs to pass.
+        run: exit 1