Support docker functionality in Gitea CI tasks

[dboreham]

Gitea's act runner as-is didn't support full docker and docker compose functionality, needed by existing CI tasks in our projects..

[telackey]

I have opened up a couple of PRs against gitea/act_runner and a couple more against our own repos for the functionality that we need:

act_runner:
https://gitea.com/gitea/act_runner/pulls/83 (merged)
https://gitea.com/gitea/act_runner/pulls/84 (under review)

Both are incorporated into a temporary fork we can use until they are both merged: https://github.com/telackey/act_runner

For our own repos, that led to:

#19
#23
cerc-io/stack-orchestrator#238

So that we know have automatic deployment of act_runner via stack-orchestrator.

As regards our repos, we have:

cerc-io/go-ethereum#351
cerc-io/laconic-sdk#38

Which are PRs for the minor refactoring work to deal with limitations of the Gitea actions are they stand now (see #25 and #26)

[telackey]

I think we can call this issue closed, since we've got the necessary changes made for our use, but it is worth adding an update when our changes are merged upstream.