don't tag alpha/rc etc latest

[tetov]

Realized that if a tag such as v1.2.3-alpha would be pushed to git then this workflow would tag that as latest image and push to dockerhub.

Since latest on dockerhub basically means latest stable that would not make sense. I've added tags to the docker/metadata-action action copied from their semver example.

Here's a copy of the table they provide to explain output tags:

Event	Ref	Docker Tags
pull_request	refs/pull/2/merge	pr-2
push	refs/heads/master	master
push	refs/heads/releases/v1	releases-v1
push tag	refs/tags/v1.2.3	1.2.3, 1.2, latest
push tag	refs/tags/v2.0.8-beta.67	2.0.8-beta.67

[tetov]

(master should be main, right?)

Pushes to refs/head/${branch_name} creates and pushes tag named ${branch_name}.

If we don't want that, we could add a check to the push step to make sure that we only push main and tags.

[gonzalocasas]

It's good as it is! 👍