JDK17, 21, head: aarch_mac, x64_mac: No files included in stash ‘jmods’

[adamfarley]

Thank you for reporting a broken build! Please fill in the following details:

• Jenkins link to the failing log:
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk17u/job/jdk17u-mac-x64-temurin/556/
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk17u/job/jdk17u-mac-aarch64-temurin/501/
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk21u/job/jdk21u-mac-x64-temurin/176/
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk21u/job/jdk21u-mac-aarch64-temurin/160/
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk/job/jdk-mac-aarch64-temurin/364/
  Failure: https://ci.adoptium.net/job/build-scripts/job/jobs/job/jdk/job/jdk-mac-x64-temurin/353/
• Which platforms (OS+arch) are affected?:
  Mac, for x64 and aarch64.
• If you look at the historic logs, does the problem appear to be specific to one machine?:
  No. All Orka nodes though.
• Link to any upstream project bug report (e.g. OpenJ9/JBS):
  None.
  Other details:
  Possible fix: Skip internal signing phase unless on windows/mac ci-jenkins-pipelines#1137

Subsequent builds appear to pass. Issue raised for history.