Make docker images available to the public

[ChaoticTempest]

Currently we don't have any docker images available for users to make use of. We can just point the GH docker image pipeline to make these images public. Some common usage would be for test purposes when setting up a local environment to test against chain-signatures features in something like near-workspaces.

[volovyks]

It is already done, but not linked to the repo. @kmaus-near will look into it