brew bump-formula-pr should truncate long PR bodies

[Moglum]

brew doctor output

> brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  icu4c@76

Warning: The following formulae have the same name as core formulae:
  alexnabokikh/tfsort/tfsort
  aws/tap/eksctl
  azure/kubelogin/kubelogin
  busser/tap/tfautomv
  derailed/popeye/popeye
  goreleaser/tap/goreleaser
  goreleaser/tap/nfpm
  kubeshark/kubeshark/kubeshark
  minamijoyo/hcledit/hcledit
  minamijoyo/tfupdate/tfupdate
  vmware-tanzu/carvel/kapp
  vmware-tanzu/carvel/kbld
  vmware-tanzu/carvel/ytt
Their taps are in use, so you must use these full names throughout Homebrew.

Verification

• My "brew doctor output" above says Your system is ready to brew. and am still able to reproduce my issue.
• I ran brew update twice and am still able to reproduce my issue.
• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

brew config output

❯ brew config
HOMEBREW_VERSION: 4.4.32-75-g50b70e3
ORIGIN: https://github.com/Homebrew/brew
HEAD: 50b70e3cb72e994cd7f530960dfb47255fdf2a34
Last commit: 3 hours ago
Branch: master
Core tap HEAD: a5729e56492cde8ade31f0ab9bd522c76231cdf0
Core tap last commit: 10 minutes ago
Core tap JSON: 28 Apr 10:26 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_BROWSER: wslview
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :0
HOMEBREW_EDITOR: code -w
HOMEBREW_MAKE_JOBS: 20
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.3 => /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.3/bin/ruby
CPU: 20-core 64-bit alderlake
Clang: 20.1.3
Git: 2.49.0 => /home/linuxbrew/.linuxbrew/bin/git
Curl: 8.5.0 => /bin/curl
Kernel: Linux 5.15.167.4-microsoft-standard-WSL2 x86_64 GNU/Linux
OS: Ubuntu 24.04.2 LTS (noble)
WSL: 2 (Microsoft Store)
Host glibc: 2.39
/usr/bin/gcc: 13.3.0
/usr/bin/ruby: N/A
glibc: N/A
gcc@11: N/A
gcc: 14.2.0_1
xorg: N/A

What were you trying to do (and why)?

I wasn't sure if this fits more here or in Homebrew/core, but I believe it's a bug in brew. I'd be happy to open a separate issue if needed.

I wanted to upgrade Kyverno CLI to the latest released version 1.14.0 https://github.com/kyverno/kyverno/releases/tag/v1.14.0, but it wasn't available.
I tried looking for an existing open PR for https://github.com/Homebrew/homebrew-core/blob/a5729e56492cde8ade31f0ab9bd522c76231cdf0/Formula/k/kyverno.rb
Eventually, I learned about brew bump and tried

❯ brew bump kyverno
==> kyverno
Formula is autobumped so will have bump PRs opened by BrewTestBot every ~3 hours.

What happened (include all command output)?

The cause seems to be that the autobump CI Action is failing with:

Failure while executing; `/usr/bin/env git push --set-upstream ***github.com/Homebrew/homebrew-core bump-kyverno-1.14.0:bump-kyverno-1.14.0` exited with 1. Here's the output:
To https://github.com/Homebrew/homebrew-core
 ! [rejected]                bump-kyverno-1.14.0 -> bump-kyverno-1.14.0 (non-fast-forward)
error: failed to push some refs to 'https://github.com/Homebrew/homebrew-core'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. If you want to integrate the remote changes,
hint: use 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

https://github.com/Homebrew/homebrew-core/actions/runs/14703087451/job/41256558075#step:6:7819

The errors started , just after the new version got released with:

Error: Unable to open pull request: Validation Failed: [{"resource" => "Issue", "code" => "custom", "field" => "body", "message" => "body is too long (maximum is 65536 characters)"}]!

https://github.com/Homebrew/homebrew-core/actions/runs/14655527237/job/41129811771#step:6:7657

Maybe it's caused by the very long release notes in https://github.com/kyverno/kyverno/releases/tag/v1.14.0 which brew bump is not able to handle?

What did you expect to happen?

The Kyverno formula should have been autobumped by the normal CI process.

Step-by-step reproduction instructions (by running brew commands)

Run the `Bump formulae on schedule or request` CI Workflow 
https://github.com/Homebrew/homebrew-core/actions/workflows/autobump.yml

Kyverno fails with

[carlocab]

Deleting the existing branch and attempting another autobump results in

Error: Unable to open pull request: Validation Failed: [{"resource" => "Issue", "code" => "custom", "field" => "body", "message" => "body is too long (maximum is 65536 characters)"}]!

https://github.com/Homebrew/homebrew-core/actions/runs/14707432565/job/41271030429#step:6:51

We probably need to truncate the auto-generated PR body.