Disallow deploying branches out-of-date with main #235
Description
My team relies on the branch-deploy functionality to prevent deploying branches that are out of date (i.e. update_branch = "warn"). We noticed recently that there's a nuance to this though: it only prevents deploying PRs that are out of date with their base branch.
My team uses a stacked diffs workflow; the main relevant effect of that here is that it's not uncommon for branches to be stacked on top of each other - i.e. featureA's base branch is main, but featureB's base branch is featureA. As-is, branch deploy would allow us to deploy featureB even if the stack including featureA and featureB is out of date when comparing against main.
For the time being we have a workaround by just adding our own condition to our action that checks the result of
git rev-list --left-right --count origin/main..origin/featureB | awk '{print $2}'but in an ideal world, it would be great if this could be implemented by branch-deploy internally.
Something along the lines of an input like outdated_mode with options pr_base and default_branch (defaulting to pr_base to prevent this being a breaking change).