Merge tool installation rules in Makefile

[Camila-B]

Several tools (kind, go-junit-report, crane) use a redundant two-step process: they install to the default GOBIN and then copy the binary to $(BIN_DIR). These can be merged into a single step by setting GOPATH (as is done for go-licenses and addlicense) then installing the tool.

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[gemini-code-assist]

Summary of Changes

Hello @Camila-B, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the Makefile to improve the efficiency and consistency of Go tool installations. By directly installing tools like kind, go-junit-report, and crane to their final destination using a specified GOPATH, it eliminates redundant copy operations and streamlines the build process. This change enhances maintainability and reduces the overall complexity of the build environment setup.

Highlights

• Streamlined Tool Installation: The installation process for kind, go-junit-report, and crane in the Makefile has been consolidated from a two-step process (install to GOBIN then copy) into a single step.
• GOPATH Utilization: The GOPATH environment variable is now explicitly set during the go install command for these tools, directing the installation directly to the desired $(BIN_DIR).
• Reduced Makefile Complexity: Intermediate targets for installing tools to $(GOBIN) have been removed, simplifying the Makefile structure for these dependencies.

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Changelog

• Makefile
  • Removed intermediate targets for $(GOBIN)/kind, $(GOBIN)/go-junit-report, and $(GOBIN)/crane.
  • Modified the $(KIND) target to directly install kind using GOPATH.
  • Modified the $(GO_JUNIT_REPORT) target to directly install go-junit-report using GOPATH.
  • Modified the $(CRANE) target to directly install crane using GOPATH.

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[gemini-code-assist]

Code Review

This pull request simplifies the Makefile by merging the two-step installation process for kind, go-junit-report, and crane into a single step. By setting the GOPATH environment variable directly during the go install command, the intermediate step of copying the binary from the default GOBIN is eliminated. This change makes the installation rules for these tools consistent with others in the Makefile, such as go-licenses and addlicense, improving readability and maintainability. The changes are correct and well-executed.

[mikebz]

I am actually curious why we need these complex makefiles in general...
https://github.com/helm/helm/blob/main/Makefile - comparison