add PR template

Signed-off-by: Matias Charriere <[email protected]>

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+<!--
+@team-cabbage will automatically be requested for review once this PR has been submitted.
+-->
+
+This PR:
+
+- _Adds/changes/fixes/removes ..._
+
+---
+
+## Checklist
+
+- [ ] I added a CHANGELOG entry
+- [ ] I ran E2E tests in the CI pipelines
+
+Add the following comment to trigger the E2E tests:
+
+`/run app-test-suites`