Redesign CI to use workflow calls

[rical]

Description

This PR redesigns the existing github build and test workflow to support workflow calls.

Main changes:

• Add workflow calls.
• Split build.yml into build.yml and test.yml.
• Add a self trigger to run build and test on push and PR.
• Increase parameterisation.

A Spin of Infix can now use workflow calls to run Infix build and test directly. This means an Infix Spin doesn't have to duplicate or create there own github workflow for building and testing.
Here's an example of how that might look (pseudo):

name: Infix SpinX CI

on:
  pull_request:
    types: [opened, synchronize, reopened, labeled]
...
jobs:
  build-infix-x86_64:
    uses: kernelkit/infix/.github/workflows/build.yml@main
    with:
      name: "Infix-SpinX"
      target: "x86_64"
      infix_repo: "kernelkit/infix"

  test-infix-x86_64:
    needs: build-infix-x86_64
    uses: kernelkit/infix/.github/workflows/test.yml@main
    with:
      name: "Infix-SpinX"
      target: "x86_64"
      infix_repo: "kernelkit/infix"
      ninepm-conf: "test/9pm-proj.yaml"
      test-path: "infix/test"

  publish-infix:
    needs: test-infix-x86_64
    uses: kernelkit/infix/.github/workflows/publish.yml@main
    

Checklist

Tick relevant boxes, this PR is-a or has-a:

• Bugfix
  • Regression tests
  • ChangeLog updates (for next release)
• Feature
  • YANG model change => revision updated?
  • Regression tests added?
  • ChangeLog updates (for next release)
  • Documentation added?
• Test changes
  • Checked in changed Readme.adoc (make test-spec)
  • Added new test to group Readme.adoc and yaml file
• Code style update (formatting, renaming)
• Refactoring (please detail in commit messages)
• Build related changes
• Documentation content changes
  • ChangeLog updated (for major changes)
• Other (please describe):

[troglobit]

Sad to see Bob go 🏗 👷 but otherwise this looks like a very nice cleanup that make it quite a bit more professional! 👏👏👏

[mattiaswal]

Rename my mistake please ❤️

[troglobit]

@rical are you still "hogging" the Styx test system? (It might be why it hasn't picked up this job yet ...)

[rical]

@rical are you still "hogging" the Styx test system? (It might be why it hasn't picked up this job yet ...)

I released it early this morning. Guess it's still working on its backlog.

[troglobit]

All tests pass, let's merge!