Add START_TIMEOUT

[Minituff]

Summary

• Fixes misleading ERROR log when a container with a restart policy takes a moment to reach running state after backup — downgraded to WARN since the backup completes successfully
• Adds INFO: Container X is now running. confirmation log when a container eventually stabilizes after retries
• Adds configurable START_TIMEOUT environment variable (default: 10 seconds) controlling how long Nautical waits for a container to reach running state, checking every 2 seconds
• Adds per-container nautical-backup.start-timeout label to override START_TIMEOUT for individual containers

Before / After

Before (v2.20.0):

INFO: Starting scrutiny...
ERROR: Container scrutiny was not in running state. Trying again (Attempt 1/3)
WARN: Container scrutiny is in 'restarting' state, waiting for it to stabilize (Attempt 2/3)
WARN: Container scrutiny is in 'restarting' state, waiting for it to stabilize (Attempt 3/3)
INFO: Backup of scrutiny complete!

After:

INFO: Starting scrutiny...
WARN: Container scrutiny was not in running state. Trying again (Attempt 1/5)
WARN: Container scrutiny is in 'restarting' state, waiting for it to stabilize (Attempt 2/5)
WARN: Container scrutiny is in 'restarting' state, waiting for it to stabilize (Attempt 3/5)
INFO: Container scrutiny is now running.
INFO: Backup of scrutiny complete!

New options

Option	Default	Description
START_TIMEOUT=10	10s	Global startup wait. Nautical checks every 2s, giving up after this many seconds.
nautical-backup.start-timeout=10	inherits START_TIMEOUT	Per-container override.

Test plan

• Existing start-container tests pass unchanged
• New test: 3 consecutive restarting states before running (reproduces issue Container running state error. #683)
• New test: start-timeout label overrides global START_TIMEOUT env var

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.01%. Comparing base (8b25fda) to head (31a592f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
+ Coverage   91.96%   92.01%   +0.05%     
==========================================
  Files           9        9              
  Lines        1107     1114       +7     
==========================================
+ Hits         1018     1025       +7     
  Misses         89       89              

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