Support Generate Metadata Step

[dwinchell]

This story is to make it run the PSR "generate-metadata" step near the beginning of the workflow, which gathers and records information about the application being built. This is the first actually useful PSR functionality we will implement using GitHub Actions.

Success Criteria:

• The GitHub minimal workflow executes the Generate Metadata step using the PSR
• The PSR log output says that the step was successful
• The workflow runs on a self-hosted runner on OpenShift
• The step invokes 3 StepImplementers - Maven, Git, and SemanticVersion

Notes:

• Uncomment this line to get started - https://github.com/ploigos/ploigos-github-workflows/blob/main/.github/workflows/minimal.yaml#L28
• We will have to add a PSR configuration file to java-github-example. We can copy this as a starting point - https://github.com/ploigos-reference-apps/reference-quarkus-mvn/blob/main/cicd/ploigos-integration-environment/shared/minimal/ploigos-step-runner-config/config.yml

Out of Scope:

• Other steps