SLOP-237: preserve job exit status in generated cron entries

[tosfos]

Summary

• Generated cron entries piped job output through tee unconditionally, so the pipeline exit status came from tee: supercronic saw exit 0 even when the scheduled job failed (reproduced: inner sh -c 'false; exit 7' reported as 0).
• The entry now runs under bash -c 'set -o pipefail; ... | tee ...' (bash ships in this image), preserving the job's exit status while keeping the per-run log file behavior identical.
• Verified with a stubbed docker exec + supercronic-faithful harness: failing job -> supercronic sees 7; passing job -> 0; both still logged.

Jira: SLOP-237

Test plan

• shellcheck -x --shell=sh update_cron.sh clean
• bash -n update_cron.sh clean
• Entry passes supercronic -test
• Hermetic repro: failing job now surfaces its exit code; successful job unaffected; logs still written

[coderabbitai]

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[github-actions]

🐳 The image based on 808b6d34 commit has been built with 20260822-15 tag as ghcr.io/wikiteq/cron:20260822-15