Auto tag action

[emteknetnz]

ACs

• [ ] Migrate https://github.com/emteknetnz/github-actions-ci-cd/blob/main/.github/workflows/auto-tag.yml to a new actions silverstripe/github-actions-auto-tag
• [ ] Update readme instructions for how to use this action for other action modules e.g. silverstripe/github-actions-ci-cd, silverstripe/github-actions-generate-matrix

[emteknetnz]

Use https://github.com/silverstripe/github-actions-ci-cd/issues/36 instead