community/caddy: missing version number in `caddy version` command

Package Information

• Package name: community/caddy
• Package version: 2.7.6-r3
• Alpine version: edge
• Alpine architecture: x86

Summary

I'm posting here as an upstream maintainer of Caddy.

When users run caddy version, they see unknown. This is confusing, because the version should be known.

We've had many users complain about this over the years, but I was never sure where to post or who to ask to fix it. Finally found this gitlab instance. See https://github.com/caddyserver/caddy/issues/6240 for a user's complaint.

Steps to reproduce

• Install caddy
• run caddy version
• see unknown

Solution

There's a few ways to fix this.

• As per our README https://github.com/caddyserver/caddy?tab=readme-ov-file#with-version-information-andor-plugins build using a fresh module and pin to a specific tag. This way you wouldn't need to clone the code, and you could just make use of Go's tooling to build.
• Use our xcaddy tool which automates the above steps, e.g. xcaddy build v2.7.6, obviously this means the build server needs to download and install xcaddy, so I envision this wouldn't be a preferred solution, but I don't know how your build server works; is it containerized/isolated? if so then this could work fine.
• See https://github.com/caddyserver/caddy/pull/5072, we added a '-X (...).VersionString=v1.2.3' build flag which can be used to directly set the version number. This is the "worst" solution because it doesn't also embed the info pulled from git, but it would at least show a version number.

/cc @mpolanski @Celeste