fix: Fix ORGANICE_WEBDAV_URL not getting inserted correctly #952

[youguanxinqing]

Fix #952

There are three problems:
1、 No .env.sample in docker image of production.

2、 Failed beacause $VALUE (enviroment value) contains '/'
when do sed -i "s/$KEY/$VALUE/g" "$DST"/**/*.js

3、 $DST equals "serve" but serve -p 5000 -s build in entrypoint.sh.
set -x for entrypoint.sh and transient_env_vars.sh，we would get messages:

+ sed -i 's|ORGANICE_WEBDAV_URL|https://organice.example.org/dav|g' serve/public.2c69fddf.js serve/public.a9de6ea2.js
+ serve -p 5000 -s build

In reality, I think we should -s serve.