Adjust the release process: Sign off the cmd/ctl and push the tag only after merging the PR

[wallrj]

Preview: https://deploy-preview-1363--cert-manager-website.netlify.app/docs/contributing/release-process/#process-for-releasing-a-version

While releasing v1.13.3, I didn't signoff the commit which updates the cmd/ctl/go.mod file, which caused the PR to fail the DCO checks.

• I've added the --signoff option in this PR.

The problem was compounded by the fact that I had already pushed the cmd/ctl@v1.13.3 tag to the cert-manager repo.

• I've changed the order of the instructions so that the Tag only gets pushed after the PR has been merged.

[wallrj]

/hold until I've tested these instructions in the v1.12.7 release.

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[maelvls]

Hey. Thanks for updating the release process! And sorry about the pain created by my missing --signoff as well as the backwards instructions (push tag before merging PR...)

/lgtm /approve

[wallrj]

/unhold

[wallrj]

@maelvls PTAL

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