Support digest pinning/updating for renovate config shareable presets

[scop]

Tell us more.

It would be nice if the renovate config manager supported digest pinned releases like Docker and GitHub Actions do, and plain digest bumping if feasible.

Example repo at https://github.com/scop/test2, with config

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": [
    "config:best-practices",

    "github>kachick/renovate-config-dprint#1.0.0",
    // pinDigests support would be nice, so an update would change the above to e.g.
    //   "github>kachick/renovate-config-dprint#1a2f26400f460486aefe8ea1e9405b239917ebe9", // 1.3.0

    "github>kachick/renovate-config-asdf#e3e9d2d2ee50d242141f936b564023dfbbace5c0",
    // digest-only bumps would be useful too, so an update would change the above to e.g.
    //   "github>kachick/renovate-config-asdf#e32315606523a360abfd784a0275c3aa0c74e872",
  ]
}

With regards to the plain digest bumping (the latter case), branches are a consideration. I don't know if any other managers support that either.