[gha/docker] build with branch name; also cleanup #538
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Builds off of special branches like
main
get image tags now in the form:<branch_name>
<branch_name>_<git_sha>
This is useful for Forge, which by default should use the latest stable processors version. Currently it's pinned to some recent commit hash
Also general cleanup of branch push triggers
Test plan
Canary runs on push to PR branch. It pushes all the expected tags
And it's in GAR