Develop process for building and maintaining major version tags for pining

[andyfeller]

Taking a page from other GitHub Actions like actions/checkout, I would hope that this action would provide a similar experience where we can subscribe to the latest changes of a given major version to avoid breakage when backwards incompatible changes come up. Realizing we're not talking about labeling container images, which are designed for this, I imagine this would look similar to what GitHub is doing by creating and recreating tags.