Change checkpoint exit code to 77

Condor's own implementation of singularity only allows exit codes up to 127. At checkpoint time, we currently exit with 130. Singularity reads this as -2, causing condor to read the job as failed. This MR changes the BayesWave exit code to 77 and updates the pipeline to tell condor this means the job has successfully checkpointed.

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• efbb5c7a - add test branch to CI

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• efbb5c7a...8d63f87d - 2 commits from branch lscsoft:master
• ecefd8b6 - Merge remote-tracking branch 'upstream/master' into lower-checkpoint-exit-code

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added 1 commit

• 33698612 - Change checkpoint exit code to 77

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mentioned in commit d1469cb7