chore(release): v0.38.4

[fclairamb]

🤖 I have created a release beep boop

0.38.4 (2026-10-12)

Bug Fixes

• ci: make the nightly workflow pass again (#531) (e37c204)
• dash0: stop pre-filling a webmail domain as the first check target (#532) (b3e6672)
• deps: update github.com/dop251/goja digest to 480b366 (#545) (b86f196)
• deps: update go dependencies (non-major) (#543) (87eb548)
• helm: keep uploaded files on the volume when running on PostgreSQL (30218d5)
• log: pick the log format from the environment (#536) (4c13730)
• log: quieter startup and a ready line with the URL (#538) (bbe682a)
• samples: seed only sample checks that work out of the box (#537) (262c2cc)
• stop warning about normal things on a fresh start (#539) (caf64b4)
• watchdog: stale-incidents counts checks.last_result_at (#542) (bd4af36)

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