test: add xtrace for github action shells

For all Rook-maintained GH actions, use a default shell that has xtrace
enabled to help debug any errors.

Enable xtrace on all actions except these that use only external tools:
- codespell
- commitlint (wagoid/commitlint)
- golangci-lint
- helm-lint (chart-testing)
- stale
- yamllint

Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>

.github/workflows/codegen.yml

@@ -11,6 +11,11 @@ on:
       - master
       - release-*
 
+defaults:
+  run:
+    # reference: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#using-a-specific-shell
+    shell: bash --noprofile --norc -eo pipefail -x {0}
+
 jobs:
   codegen:
     runs-on: ubuntu-18.04