Figure out how to publish alpha/beta releases to Docker Hub

[simonw]

It looks like all I need to do to ship an alpha version to Docker Hub is NOT point the latest tag at it after it goes live:

datasette/.github/workflows/publish.yml

Lines 75 to 77 in 1a8972f

	docker tag $REPO:${GITHUB_REF#refs/tags/} $REPO:latest
	docker push $REPO:${VERSION_TAG}
	docker push $REPO:latest

Originally posted by @simonw in #1319 (comment)

[simonw]

I'm going to try pushing an alpha of https://github.com/simonw/datasette/releases/tag/0.57a0 using this workflow I built a few months ago: https://github.com/simonw/datasette/blob/1a8972f9c012cd22b088c6b70661a9c3d3847853/.github/workflows/push_docker_tag.yml

[simonw]

https://github.com/simonw/datasette/actions/workflows/push_docker_tag.yml

[simonw]

https://hub.docker.com/r/datasetteproject/datasette/tags?page=1&ordering=last_updated now shows this at the top: https://hub.docker.com/layers/datasetteproject/datasette/0.57a0/images/sha256-4ab61095c1d879a91d154ed469227387356a305035da9c74542c55bd500c89db?context=explore

[simonw]

That worked:

 % docker run -it datasetteproject/datasette:0.57a0
Unable to find image 'datasetteproject/datasette:0.57a0' locally
0.57a0: Pulling from datasetteproject/datasette
75646c2fb410: Pull complete 
edf8b70d3cc4: Pull complete 
229daa3ebd94: Pull complete 
65d21ac50a56: Pull complete 
e083ad7cc3ca: Pull complete 
ed4de1431432: Pull complete 
1da5e8b27cca: Pull complete 
Digest: sha256:4ab61095c1d879a91d154ed469227387356a305035da9c74542c55bd500c89db
Status: Downloaded newer image for datasetteproject/datasette:0.57a0
INFO:     Started server process [1]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:8001 (Press CTRL+C to quit)