Included are two scripts:

1. 01_secret-init.sh, a Bourne shell (sh) script
2. 01_s6-secret-init.sh, a Bourne shell script to run in S6 container environments

Credit to (linuxserver.io)[https://github.com/linuxserver/docker-baseimage-ubuntu/blob/bionic/root/etc/cont-init.d/01-envfile], the source of the logic for these scripts

Scripts must be added to Docker image and called at container launch.

If using secret-init.sh, you can either:

• Run script as CMD or ENTRYPOINT from the Dockerfile
• Run script from an init script, where the init script is run via CMD or ENTRYPOINT

# dockerfile excerpt
COPY secret-init.sh /usr/local/bin/
ENTRYPOINT [ "docker-entrypoint.sh" ]

If using s6-secret-init.sh, simply copy the script to /etc/cont-init.d/` when building the Docker image, and S6 will automatically run the script as part of container init.

# dockerfile excerpt
COPY 01_envfile.sh /etc/cont-init.d/