Document steps to create a release

[grantr]

Fixes #830.

Rendered

As an eventing contributor, I want a concise ordered list of commands to run, but the docs in test-infra don't have those.

These steps were previously documented in #1020 but removed in #1548, replaced with a (less discoverable) comment in hack/release.sh linking to https://github.com/knative/test-infra/tree/master/ci.

/cc @adrcunha

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[grantr]

/cc @vaikas-google

[n3wscott]

/lgtm

[adrcunha]

That's not true, as the minor release job only runs once a week. All commits added to the latest release branch will eventually be published together as a new minor release.

[adrcunha]

These steps were previously documented in #1020 but removed in #1548

My apologies for not noticing you better and correctly documented the automated procedures in 1020. Thanks for the new instructions, they're even better than the previous ones and those in test-infra. I'll shamelessly copy them to test-infra for the other repos. ;)