Publish `.nightly` tags nightly #405

Job	Run time
shellcheck	2s
Build heroku-20 (amd64)	3m 48s
Build heroku-22 (amd64)	2m 59s
Build heroku-24 (amd64)	2m 18s
Build heroku-24 (arm64)	7m 11s
Publish heroku-${{ matrix.stack-version }} (${{ matrix.arch }})	0s
Upload heroku-${{ matrix.stack-version }} runtime images	0s
Publish heroku-${{ matrix.stack-version }} indices	0s
Promote heroku-${{ matrix.stack-version }} tags	0s
	16m 18s

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