permanent links to forgejo actions artifacts

forgejo has no stable URL for the artifacts of the latest run of a workflow: the run number changes on every push. this service resolves that, on code.cuddles.rs.

url forms

`/owner/repo/workflows/workflow/branch`	artifacts of the latest successful run of `workflow` on `branch`
`/owner/repo/workflows/workflow/branch/artifact`	one named artifact; append `.zip` to download it directly
`/owner/repo/actions/runs/n`	artifacts of one specific run, by the number shown in the forgejo ui
`/owner/repo/actions/runs/n/artifact`	one named artifact of that run; `.zip` downloads it
`/owner/repo/actions/artifacts/id`	one artifact by its api id; `.zip` downloads it

the workflow segment is the workflow file name; the .yml extension may be omitted. add ?status=completed to accept the latest finished run instead of the latest successful one.

example

A download link that always points at the current build:

https://noon.code.cuddles.rs/myorg/myrepo/workflows/build/main/binaries.zip

caveats

branch names containing a slash are not addressable in the /workflows/ form, since the path would be ambiguous. use the /actions/runs/ form for those.
artifacts expire according to the instance's retention settings; a link to an expired artifact returns 404.
only repositories that are readable anonymously are served.

source /\/\ inspired by nightly.link