`if: github.event.pull_request.base.ref == ''` was meant to gate
bump-and-tag to push events (not pull_request events which route to
pr-validate). However, on a PR-merge push in Gitea Actions, the
pull_request context is still attached with base.ref='main', so the
condition always evaluated to false and bump-and-tag was permanently
skipped.
Fix: replace with `if: github.event_name == 'push'` which correctly
fires only on branch pushes after the PR is merged.
Also add `workflow_dispatch` trigger so the workflow can be manually
dispatched when the Gitea Actions API (/actions/*) is unreachable
(act_runner 404 on Gitea 1.22.6 — internal#327).
Closes internal#327.
infra-runtime-be