[Feature] add docker-entrypoint.sh as starter script

[moooofly]

Targets

• for complicated signals processing
• for running other commands

Ref

• dockerfile_best-practices/#entrypoint
• reference/builder/#entrypoint
• Dockerfile 中的 ENTRYPOINT 指令 -- private

Related

• The exec builtin command
• gosu 使用 -- private
• Use multi-stage builds

[moooofly]

Sample code of docker-entrypoint.sh

#!/bin/bash

set -e

if [ "$1" = 'agent' ]; then
    exec gosu root "$@"
fi

exec "$@"

Sample code of Dockerfile

...
COPY docker-entrypoint.sh /
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["agent"]