add set -e and use exec to replace parent process to handle docker signals (#6)

use `exec` to turn httpd into parent process. This is important for docker signalling such as `docker stop ${container_id}`
add `set -e` which stops the entrypoint script if any command exits with a non-zero exit code.

Reviewed-on: https://git.lolcat.ca/lolcat/4get/pulls/6
Co-authored-by: throwaway <developerthrowaway@protonmail.com>
Co-committed-by: throwaway <developerthrowaway@protonmail.com>

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