Update GitHub actions badge path generation

[oalders]

I'm not sure if this has changed recently, but according to https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/adding-a-workflow-status-badge a badge should look something like

![example workflow](https://github.com/<OWNER>/<REPOSITORY>/actions/workflows/<WORKFLOW_FILE>/badge.svg)

What I'm seeing generated for https://github.com/oalders/App-perlvars is:

[![Actions Status](https://github.com/oalders/App-perlvars/workflows/dzil-build-and-test/badge.svg)](https://github.com/oalders/App-perlvars/actions)

I believe it should actually be:

![Actions Status](https://github.com/oalders/App-perlvars/actions/workflows/dzil-build-and-test.yml/badge.svg)

[fayland]

released. Thanks