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Introduce a variable to enable shell tracing on bash, cmd.exe and powershell.exe

Nick Thomas requested to merge nick.thomas/gitlab-ci-multi-runner:1711-ci-shell-trace-variable into master

What does this MR do?

Allows users to enable debug tracing during builds, using set -o xtrace, @echo on and Set-PSDebug -Trace 1, respectively.

Why was this MR needed?

Debugging failures partway through the execution of a generated script is currently tricky, as any one of a number of commands could have failed. Enabling this feature for a failing build will ease the process considerably.

Are there points in the code the reviewer needs to double check?

Should the variable have a different name?

Should PSDebug be -Trace 1 or -Trace 2?

Should cmd.exe explicitly set @echo on? I'm pretty sure it's the default

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Closes #1711 (closed)

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