Git SSH Urls cannot select a branch

When using envbuilder with a git ssh url we cannot target a specific branch. Tracing this through it's because of the giturls library succeeds in parsing a transport/http regex and gleans the url fragment and this is mapped to a branch in coder. However for ssh no fragment is parsed in the scpProvider regex. Presumably it would be good to have a way similar to https to signal to coder a branch we want to check out. If this can't be done via the Git url then perhaps another env var / parameter needs to be available to achieve this

Start with the giturls parsing path, especially the scpProvider regex, and compare it with transport/http parsing and how coder maps URL fragments to branches. Confirm how an SSH URL or another parameter can express the requested branch, then verify that an SSH-based envbuilder build checks out it.

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