gha: add release branch for running the release job - #194

Rule: automatic rebase for backport PRs (update)

• #commits-behind > 0 [📌 update requirement]
• -closed [📌 update requirement]
• head~=^mergify/bp/
• -conflict [📌 update requirement]
• queue-position = -1 [📌 update requirement]

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• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

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