.github/workflows: Avoid running the e2e-tests workflow on doc-only pull requests (#2299)

Update the e2e-tests.yml github workflow and avoid running that action
on PRs that only change the doc directory.

Signed-off-by: timflannagan <[email protected]>

Author: timflannagan

.github/workflows/e2e-tests.yml

@@ -4,6 +4,9 @@ on:
     branches:
       - master
   pull_request:
+    paths:
+      - '**'
+      - '!doc/**'
 jobs:
   run-e2e-tests:
     runs-on: ubuntu-latest