Document how to release flytectl (#5537)

Signed-off-by: Eduardo Apolinario <eapolinario@users.noreply.github.com>
Co-authored-by: Eduardo Apolinario <eapolinario@users.noreply.github.com>

flytectl/RELEASE.md

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+# Release Process
+
+Flytectl releases map to git tags with the prefix `flytectl/` followed by a semver string, e.g. [flytectl/v0.9.0](https://github.com/flyteorg/flyte/releases/tag/flytectl%2Fv0.9.0).
+
+To release a new version of flytectl push a new git tag in the format described above. This will kick off a <[github workflow](https://github.com/flyteorg/flyte/blob/master/.github/workflows/flytectl-release.yml) responsible for releasing this new version. Note how the git tag has to be formatted a certain way for the workflow to run.