ci: Changed tagging and amend multi-arch manifest

[dgiebert]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed the CLA.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

Hopefully finally closes #2080

[alexec]

Lets hope!

[dgiebert]

Whats the matter with the Semantic Pull Request ? 😓

[alexec]

Whats the matter with the Semantic Pull Request ? 😓

If you only have a single commit, then Github uses that, instead of the PR title, as the merge message. You can fix by pushing an empty commit, but don't bother. I'll just edit it when I merge.

[alexec]

Builds now passing on master: did you want to check it?

https://github.com/argoproj/argo/actions/runs/224163851

[dgiebert]

Did not work as expected:

• https://hub.docker.com/layers/argoproj/argoexec/latest/images/sha256-310980f0aba339d5a7b132304b61553d17116c86dafcf54ac0e5ccab729ee0ea

Let me check why it did only push the windows one.

I will find a solution for it, but the code in docker-ce does not support that yet: https://github.com/docker/docker-ce/blob/19.03/components/cli/cli/command/manifest/create_list.go