Support `sha` as an alternative of `tag` input

[GeoSot]

Hello,

In a need to create only draft releases (without existing tag, as it will be created after publishing it), I would like to ask if it is possible to support given sha instead of only tags.

It would be possible by changing

 const tagsRaw = await gh.graphql(`
      query lastTags ($owner: String!, $repo: String!) {
        repository (owner: $owner, name: $repo) {
          refs(first: 2, refPrefix: "refs/tags/", orderBy: { field: TAG_COMMIT_DATE, direction: DESC }) {

using after and refPrefix conditionally

[AlexisBRENON]

Just for info, using toTag and fromTag you can use shas directly.