Generic GHA to sync dists with gh releases

[galargh]

Resolves ipfs/distributions#503

This PR was extracted out of #262

Description

go-ipfs/sync-release-assets.yml and go-libp2p-relay-daemon/sync-release-assets.yml are almost identical. The only difference between the two is the name of the distribution that they are syncing. That's why I want to turn sync-release-assets.yml into a reusable workflow living in protocol/.github repository that takes dist as an input parameter(https://github.com/protocol/.github/blob/486f183d83a80dd1a48589b8bfbf1672f8167064/.github/workflows/sync-release-assets.yml).

I also want to use the unified CI framework to copy the concrete workflow(the one that is going to be using the reusable workflow) to both go-ipfs and go-libp2p-relay-daemon repositories.

Thanks to #262, we can create a sync-release-assets.yml template(

.github/templates/.github/workflows/sync-release-assets.yml

Line 11 in 486f183

dist: ${{{ config.dist }}}

) that reads the dist value from config(

.github/configs/go.json

Line 62 in 486f183

"dist": "go-ipfs"

).

Testing

• deployed new workflow to .github-test-target from testing: dispatch + copy-workflow + PR