fix: gracefully exit on sigterm

The purpose is to avoid duniter database corruption on docker stop.

Before that sigterm was ignored, causing docker instance being force-killed on docker stop command after the related timeout expiration.

Exerpt from the docker stop manpage:

The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL

requested review from @moul

approved this merge request

requested review from @c-geek and removed review request for @moul

assigned to @pini-gh

added 7 commits

• 84eef2b1...f1ba995a - 5 commits from branch nodes/typescript:dev
• 0d315c01 - chore: stick to POSIX syntax for docker entrypoint
• 00129b2b - fix: gracefully exit on sigterm

Compare with previous version

added 4 commits

• 00129b2b...6b33b8ab - 2 commits from branch nodes/typescript:dev
• 5ac8d6e3 - chore: stick to POSIX syntax for docker entrypoint
• 677b8163 - fix: gracefully exit on sigterm

Compare with previous version

enabled an automatic merge when the pipeline for 677b8163 succeeds

mentioned in commit 5311dd56

merged