Minor bug: `docker/build-and-push` does not include labels

[erikmd]

Related user(s):

No response

Related issue(s) or PR(s):

• ci(docker): Use docker/build-push-action@v4 #544

Related project scope(s):

build

Bug description:

Since PR #544, docker/build-push-action@v4 does not seem to include the following labels:

learn-ocaml/.github/workflows/deploy-master.yml

Lines 41 to 45 in a31ff2b

	labels: |
	org.opencontainers.image.created=${{ steps.prep.outputs.created }}
	org.opencontainers.image.source=${{ github.repositoryUrl }}
	org.opencontainers.image.version=master
	org.opencontainers.image.revision=${{ github.sha }}

cf. https://hub.docker.com/r/ocamlsf/learn-ocaml/tags

To reproduce:

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Expected behavior:

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learn-ocaml --version

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git describe --long --always --abbrev=40 --tags

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What OS do you use?

GNU/Linux

What OS version/distribution do you use?

Debian

What browser(s) do you use with learn-ocaml?

No response

What browser(s) version did you used to reproduce the issue?

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Screenshots (if need be):

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Additional context:

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