Disable automatic updates in org for this repo

[jsumners]

#107 added a v4 tag so that we can prepare for fastify@5 across all repos. Unfortunately, Dependabot started updating all of our repos from workflows@3 to workflows@4. And then an automation (#107 (comment)) started merging them.

We need to disable this automation for the workflows repo across all projects. We will only ever release a new major of workflows that imposes a major change in all repos that depend upon it.

attn: @mcollina @Fdawgs

[nrayburn-tech]

Is there a better way to do this other than what is being done for the tap dependency? fastify/fastify#5116 (comment)

https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#ignore

General syntax I think (not sure about the dependency-name, haven't been able to find docs for referring to the github action name).

updates:
  - package-ecosystem: "github-actions"
    groups:
        ignore:
        - dependency-name: "plugins-ci"
          update-types: ["version-update:semver-major"]

[jsumners]

The documentation is at https://github.com/fastify/github-action-merge-dependabot#excluding-packages. But I'm not clear if that works with GitHub Actions. It's possible that test needs to be conducted to determine the answer. But maybe one of the maintainers of that action will know (I have never even looked at the code, so I'm not one of them).