Add Docker multi-arch support with Buildx

[blairdrummond]

This adds Docker support to extra CPU architectures (like arm) using Docker's Buildx action

You can see what that looks like on Dockerhub

And how it lets Datasette run on a Raspberry Pi (top is my dockerhub, bottom is upstream)

The workflow log here (I subbed blairdrummond for datasetteproject in my branch)

[simonw]

This is so cool! I wonder how I can best test it? I have a Raspberry Pi I should dig out to try this.

[codecov]

Codecov Report

Merging #1319 (cfca570) into main (1b69753) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1319      +/-   ##
==========================================
+ Coverage   91.51%   91.53%   +0.02%     
==========================================
  Files          34       34              
  Lines        4255     4255              
==========================================
+ Hits         3894     3895       +1     
+ Misses        361      360       -1     

Impacted Files	Coverage Δ
datasette/utils/__init__.py	94.31% <0.00%> (+0.17%)	⬆️

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[simonw]

Started a conversation about this on Twitter. Ideally I'd like to push an alpha release to Docker Hub so people can start testing these out before they make it into an official non-alpha release.

[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

[simonw]

OK, since I have a mechanism for deploying alpha versions now I'm going to merge this and use it to publish 0.57a1.