[trivial] Prevent build.yml workflow to trigger on tags push

[nhuet]

As this trigger is already handled by release.yml for release tags.

[dbarbier]

LGTM. Out of curiosity, did you check that this works as expected on your repo?

[nhuet]

I switched to tags-ignore = "*". Both solutions (the latter and branchs = "*") worked but the new version (pointed out to me by @dbarbier) is more explicit.
You can see that build.yml is no more trigger for this tag on my repo: tag-to-test-no-build.

[nhuet]

Actually i will revert to previous version as

on:
  push:
    tags-ignore: 
      - "*"

actually prevent triggering on tags but also on branches (this is odd i know), though still working for PR
whereas

on:
  push:
    branches: 
      - "*"

work as we want: triggering on all branches push but not on tags push (but still on PR).

[nhuet]

I do not know why but my branch nh/prevent-build.yml-for-tags actually does not trigger any action on my repo whereas:

• it works for PR as we can see here
• another branch "test" at the same commit does trigger build.yml (as it was expected): https://github.com/nhuet/scikit-decide/actions/runs/1411982289
• i suspected a problem with the branch name with the dot in it, but yet another branch with a simpler name nh/prevent-build-for-tags pointing also at the same commit does not trigger build.yml either.

Very strange... 🤔