Re-enable Yaegi testing (maybe?)

[jasongoodwin]

Yaegi testing is done when the plugin is released but I disabled it as it has no dependency support. You have to vendor plugins, but we have to then copy them all to keep the build stable in our repo:

Go modules are not supported yet. Until that, it is necessary to install the source into $GOPATH/src/github.com/traefik/yaegi to pass all the tests.

I had a really hard time finding examples that worked and without access to the repo, the cycle time was too slow as our build files don't run and they won't run on a fork.

A lot of plugins just test w/ go as the traefik plugin workflow will catch any issues before publishing.

[yoeluk]

I agree. We should introduce this back into the CI/CD to test more principally during Ci/CD. It is worth noting that now traefik provides the pipeline to both build and release... see here, and for example on how to use it see this.

[jasongoodwin]

Yeah you have to copy the vendored plugins into the go src and I just couldn't iterate on it easily enough without admin access to the project to get it to work. I was wasting a lot of time waiting for approval to run the pipeline. It should be as easy as restoring that to the workflow and just copying everything but I couldn't find an example that worked and couldn't get a pass.