It works but I don’t think Forgejo plans to support it in the future. Gitea and Forgejo started to diverge and the documentation regarding docker is somewhat in a deprecated state.
Edit: I also think the OP’s question is different from this. So this might not be a solution.
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If both Caddy and Forgejo are running in Docker containers you could do SSH Container Passthrough.
Link is to Gitea docs but should work fine with Forgejo.
It works but I don’t think Forgejo plans to support it in the future. Gitea and Forgejo started to diverge and the documentation regarding docker is somewhat in a deprecated state.
Edit: I also think the OP’s question is different from this. So this might not be a solution.