Incorrect output URL when version is github.sha

[ebeloded]

TL;DR

When version input is specified as ${{github.sha}}, the action outputs an incorrect URL.

Expected behavior

Normally, when providing a version for a service, the URL produced looks like this:

VERSION-dot-SERVICE-dot-PROJECT_ID.REGION_ID.r.appspot.com

Observed behavior

However, when I specified ${{ github.sha }} for the version, the output URL comes out with . instead of -dot-, which doesn't work:

VERSION.SERVICE.PROJECT_ID.REGION_ID.r.appspot.com

NB: The version gets deployed correctly and I can visit it by using the correct URL (with -dot-s).

Reproduction

Action YAML

uses: google-github-actions/deploy-appengine@main
with:
  project_id: ${{ env.PROJECT_ID }}
  credentials: ${{ env.SERVICE_ACCOUNT_KEY }}
  deliverables: ${{ env.CONFIG_FILE }}
  promote: false
  version: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) ||  github.sha  }}