krel/ff: add an option to define a gcp project to use instead of the default one

[cpanato]

What type of PR is this?

/kind bug
/kind feature

What this PR does / why we need it:

• krel/ff: add an option to define a GCP project to use instead of the default one

The prow job that we setup (kubernetes/test-infra#25140) does not have access to kubernetes-release-test which is an older and not community-owned GCP project, and we need to work on a plan to deprecate this project, but for now we offer an option for the krel/ff command to choose which GCP project to use (and default that to k8s-staging-releng-test)

/assign @saschagrunert @ameukam
cc @kubernetes/release-engineering

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Does this PR introduce a user-facing change?

krel/ff: add an option to define a gcp project to use instead of the default one

[saschagrunert]

/lgtm
/hold

Can we do a manual test run in k8s-staging-releng-test?

[cpanato]

yes, will run it @saschagrunert gibe me some minutes

[palnabarun]

/lgtm

[cpanato]

ran a test with this change

Step #2: krel was successfully compiled and installed to /workspace/bin/krel
Finished Step #2
Starting Step #3
Step #3: Already have image (with digest): gcr.io/k8s-staging-releng/k8s-cloud-builder:v1.24.0-go1.17.6-bullseye.0
Step #3: level=info msg="Preparing to fast-forward from origin/master"
Step #3: level=info msg="Found GitHub token, using it for repository interactions"
Step #3: level=info msg="Cloning repository by using HTTPs"
Step #3: level=info msg="Using dry mode, which does not modify any remote content"
Step #3: level=info msg="No release branch specified, finding the latest"
Step #3: level=info msg="Found latest release branch: release-1.23"
Step #3: level=info msg="Tag v1.23.0 found in default remote"
Step #3: level=info msg="Fast forward not required because final tag already exists for latest release branch release-1.23"
Finished Step #3
PUSH
DONE

[cpanato]

thanks so much for @ameukam @saschagrunert for the debug session

[cpanato]

@saschagrunert are you ok to lift the hold?

[ameukam]

/lgtm

[saschagrunert]

/unhold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, saschagrunert, xmudrii

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Needs approval from an approver in each of these files:

• cmd/krel/OWNERS [cpanato,saschagrunert,xmudrii]
• pkg/OWNERS [cpanato,saschagrunert,xmudrii]

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