skip run with special commit

[camandel]

I've tried to fix issue #51 adding a new option (skip_message) at "run" level:

version: v0
runs:
  - name: run01
    skip_message: "[ci skip]"
    tasks:
      - name: task01
        runtime:
          type: pod
          containers:
            - image: busybox

  - name: run02
    tasks:
      - name: task01
        runtime:
          type: pod
          containers:
            - image: busybox

if the commit message contains the string specified in skip_message, for instance "[ci skip] Update README", run01 will be skipped and only run02 will be processed.

[sgotti]

@camandel Thanks for your PR!

The idea in #51 wasn't clear but I'd not put a skip message option in the run config.
I'll prefer having a global (and in future maybe configurable, but in a future PR) regular expression to match the commit message so users won't have to define it in every run config.

P.S. Don't close this PR but just update it

[sgotti]

@camandel I saw you updated the PR. The implementation looks good to me but we need some tests to check that everything works.

Before merging it can you add some integration tests under tests/setup_test.go that creates a commit with the [ci skip] message (one in the description and one in the message body to see that both work) and check that no run is created?

[camandel]

I added the integration tests. I'm not sure because the run failed on TestCreateProject, the same function is used in other tests that passed.

[sgotti]

@camandel Please rebase into current master your commit and force push instead of merging master inside your branch.

[sgotti]

@camandel LGTM. Thanks!