🐛 Fix kubebuild alpha generate when not in GOPATH

[freddyesteban]

Ran to an issue when running kubebuilder alpha generate, and since my project was not on the GOPATH, there was no implicit call to go mod init.

If your project is initialized within GOPATH, the implicitly called go mod init will interpolate the module path for you. Otherwise --repo= must be set.

This change updates alpha generate command so that --repo is always included when running kubebuilder init to fix issue when not on GOPATH. The value for repo is retrieved from the PROJECT file as other kubebuilder init options.

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[camilamacedo86]

/lgtm
/ok-to-test

[camilamacedo86]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, freddyesteban

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