Add release workflow

[shoriminimoe]

Add the release.yml workflow file for automatic releases. Releases are triggered by tagging a commit with a name matching v*.*.*.

The workflow follows these steps:

• Verify the release by comparing the tag name with the galaxy.yml version.
• Build the collection tar file to include as a release artifact.
• Generate release notes from CHANGELOG.rst
• Create a github release using the tag name
• Publish the release to ansible galaxy (this step will fail until a valid api key is added to the repo secrets)

[shoriminimoe]

Here are a few examples from my fork

• workflow run
• release