[CI/CD] Nightly macOS CLI build fails — SDKMAN 5.21.0 requires Bash 4+

Summary

The Nightly CLI Build / Build native image on macOS-Silicon job fails because SDKMAN 5.21.0 (released 2026-03-14) added a Bash version check that rejects Bash 3.x. The macos-14-arm64 GitHub Actions runner ships with Apple's system Bash 3.2.57, which Apple will not upgrade past 3.x due to GPL v3 licensing.

No code change caused this — it is purely an upstream SDKMAN version bump.

Failed Run

• Run: https://github.com/dotCMS/core/actions/runs/23177806270/job/67347912152#step:3:318
• Job: Nightly CLI Build / Build native image on macOS-Silicon
• Error:

  SDKMAN requires Bash 4 or higher, but you are running Bash 3.2.57(1)-release.
  

Root Cause

1. SDKMAN 5.21.0 installer (https://get.sdkman.io) added a Bash 4+ version check that exit 1s on Bash 3.x.
2. The setup-java action (.github/actions/core-cicd/setup-java/action.yml line 67) runs curl -s "https://get.sdkman.io" | bash with shell: bash.
3. On macos-14-arm64, bash resolves to /bin/bash (Apple's system Bash 3.2.57). Homebrew has Bash 5.x at /opt/homebrew/bin/bash but the shell: bash directive uses the system one.
4. The SDKMAN cache (macOS-arm64-sdkman-install) expired between the Mar 16 (success) and Mar 17 (failure) nightly runs, triggering a fresh install that hit the new check.

Timeline

Recommended Fix

In .github/actions/core-cicd/setup-java/action.yml, change the SDKMAN install step to pipe through zsh instead of bash (this is SDKMAN's own recommendation in the error message):

- name: Install SDKMan
  id: install-sdkman
  if: ${{ steps.restore-cache-sdkman.outputs.cache-hit != 'true' }}
  shell: bash
  run: |
    if [ ! -f "$HOME/.sdkman/bin/sdkman-init.sh" ]; then
    echo "Downloading SDKMAN install"
    curl -s "https://get.sdkman.io" | zsh
    fi

This is a one-line change (| bash → | zsh). The zsh shipped on macOS satisfies SDKMAN's requirements.

Alternatives

• Option B: Change the step's shell: to zsh {0} — works but changes more shell behavior
• Option C: Use /opt/homebrew/bin/bash — Bash 5.x, but path may not be stable across runner image updates

Impact

• Blocks all macOS native CLI builds whenever the SDKMAN cache is cold
• Will recur on every nightly/PR/merge-queue run that triggers the macOS CLI job after cache expiry
• No workaround short of the fix

🤖 Generated with Claude Code

In .github/actions/core-cicd/setup-java/action.yml around line 67, inspect the Install SDKMan step and its shell commands. Update the SDKMAN install pipe as described, then verify the Nightly CLI Build / Build native image on macOS-Silicon job with a cold SDKMAN cache on macos-14-arm64; done means SDKMAN installation succeeds.