Add commits filtering based on tag name

[IlyaFinkelshteyn]

Skip commits feature to extend
Discussion

[tsteven4]

This cost me several hours. I was mislead by https://www.appveyor.com/docs/branches/#white--and-blacklisting which states:

Despite the option name, only and except is applied to tag names too, so the above example using only would cause tags not trigger the build.

I just wanted the following in my appveyor.yml

branches:
  except:
    - continuous-windows
    - continuous

to cause builds to be skipped that might otherwise be initiated by tag pushes with tag names continuous or continuous-windows. This works for branches with these names, but not for tags.

Unfortunately I cannot predict the message associated with the tags, so commit message filtering won't work for me.

As an ugly workaround I have:

before_build:
  - ps: |
      if (($env:APPVEYOR_REPO_TAG -eq "true") -and ($env:APPVEYOR_REPO_TAG_NAME -match "^continuous"))
      {
        echo "tag: $env:APPVEYOR_REPO_TAG tag_name: $env:APPVEYOR_REPO_TAG_NAME"
        Write-Error "This job should have been filtered out."
      }

Which causes the jobs to fail fairly quickly, but it would be preferred if the whole build never was initiated.

[IlyaFinkelshteyn]

Duplicate to #486