Gitea's act_runner mangles boolean workflow_call/dispatch inputs passed
from an expression -- they arrive as false regardless of value. Declare
`push` as a string ("true"/"false") and compare with == 'true' so the
builder image is pushed on non-PR events again.
Trivial comment changes to exercise the new CI orchestration: the
docker job should rebuild+push the builder image first, then test
and docs run against the fresh image.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
