Update makefile update-proto

[mgjm]

What type of PR is this?

/kind other

What this PR does / why we need it:

This updates the update-proto rule in the Makefile to be more robust und work with go version 1.20.

• 880e0b7 creates an intermediate file in internal/proto/conmon.capnp with the required changes for go

  • Bug: If the capnp compile step failed the applied changes didn't get reverted, when tried again the patch was applied twice
  • Bug: The git checkout at the end did remove my uncommitted changes 😢
  • The new version no longer overwrites the existing file
  • The intermediate file gets removed by make automatically, even on error

• 17780b4 updates the make rule to be compatible with go version 1.20

  • go install no longer places source code in $GOPATH/src
  • The change uses the new $GOMODCACHE = $GOPATH/pkg/mod used by go install in module mode
  • And it uses the same go capnp version as specified in the go.mod file (instead of latest)

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Verify that this change also works with older go versions (depending on the minimum required go version). I could not figure out in wich version go switched to the GOMODCACHE directory for go install.

And check that the grep rule works. Tested on Alpine and Arch Linux.

Does this PR introduce a user-facing change?

None

[mgjm]

Since the location of the capnp file changed the generated InterfaceName changed as well. But this is only used in debug messages, as far a I know.

[saschagrunert]

Thank you!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mgjm, saschagrunert

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[saschagrunert]

/lgtm