Containerize server builds

[Sayan-]

build-server.sh was assuming a bit too much about a users local env. Instead we'll just run it in docker; we're still preferring this over multi-context builds due to limitations in kraft pkg

Testing

• build + run docker locally
• build unikernel

[cursor]

Bug: Go Version Extraction Fails in Docker Tagging

The GO_REQUIRED variable, extracted from go.mod, can be empty if the grep regex ^go [0-9]+\.[0-9]+ fails to match Go versions with patch numbers (e.g., "go 1.21.5"), or if the go.mod file is missing/malformed. This results in an invalid Docker image tag golang:, causing the docker run command to fail with a cryptic error. The regex should be ^go [0-9]+\.[0-9]+(\.[0-9]+)?, and the script should handle extraction failures.

shared/build-server.sh#L27-L38

https://github.com/onkernel/kernel-images/blob/de8be786ced9142f829d4066b21308be9cf5caea/shared/build-server.sh#L27-L38

Fix in Cursor • Fix in Web

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