Build first iteration of action-publish-cpan

[mattwynne]

🤔 What's the problem you're trying to solve?

We need this github action so that we can add a release-cpan.yml to cucumber/messages#27

✨ What's your proposed solution?

Port the code over from https://github.com/cucumber/common/blob/main/.templates/perl/default.mk

Ideally, add a test package and a github workflow to this repo to test that it actually works. See the npm action for an example.

📚 Any additional context?

cucumber/common#2029

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[mattwynne]

@ehuelsmann can you help?

[mattwynne]

Note that CPAN uses a .pause file to authenticate, so we'll probably need to write this file from a secret.

[mattwynne]

@ehuelsmann I've got somewhere, but it's currently failing to find the dzil binary in the PATH on the GitHub Action container. How do we find out where cpanm has installed it?

[mattwynne]

I figured out the path thing, by installing perl ourselves but now it's giving an error when we run dzil build:

Attribute (_version_override) does not pass the type constraint because: $version is not a valid lax version string at constructor Dist::Zilla::Dist::Builder::new (defined at /usr/local/share/perl/5.30.0/Dist/Zilla/Dist/Builder.pm line 888) line 102

[mattwynne]

OK I figured that out too. If you want to use a semver-style version number you need to prefix it with a v

[mattwynne]

Nope, that didn't work. I can only seem to make the dzil we get on the GitHub Actions container accept a "numeric" version like 0.003. It works fine on my local machine.

[mattwynne]

In order to try and work out why it was different on my machine, I added some version number printing.

The GHA container has perl v5.30.0, wheras I have v5.34.0 locally.

They both end up with dzil 6.025 though.

[ehuelsmann]

dzil is compatible with any Perl 5.20.0 or up; so the version difference shouldn't be a problem.

[mattwynne]

I've modified it to use the same mechanism we use in the monorepo, leaning on [Hook::VersionProvider] to read the version in from a VERSION file. That seems to be working. I think I'm almost there!

[mattwynne]

I wish I'd done this in a branch now, rather than cluttering up main

[mattwynne]

OK I reset the main branch back to the beginning and you can now follow along in #2