Build a go-ipfs:extras docker image

[mburns]

related to #8119

This PR pushes an additional docker image called go-ipfs:extras which is built with the peerlog plugin enabled by default, and will be a place to test future in-tree plugins or other optional functionality that doesn't need to be in the stock go-ipfs image.

• update CI, add the build & push stepsd
• retire bifrost tag name, go-ipfs:extras is best friend now.

[aschmahmann]

This looks good and could probably be merged as is. We're going to take a look at moving this to Actions to synchronize Go versions with what we have in dist.ipfs.io and to start moving go-ipfs CI towards actions. cc @guseggert

[BigLep]

Per 2021-08-05 discussion: we'll create another task for doing this work in GitHub actions for saner reasoning about versions, etc.