bug: /usr/local/apisix/apisix/cli/apisix.lua:31: module 'apisix.cli.env' not found

[apchee]

Issue description

$ apisix start
/usr/local/openresty/luajit/bin/luajit /usr/local/apisix/apisix/cli/apisix.lua start
/usr/local/openresty/luajit/bin/luajit: /usr/local/apisix/apisix/cli/apisix.lua:31: module 'apisix.cli.env' n
	no field package.preload['apisix.cli.env']
	no file '/usr/local/apisix/deps/share/lua/5.1/apisix/cli/env.lua'
	no file './apisix/cli/env.lua'
	no file '/usr/local/openresty/luajit/share/luajit-2.1.0-beta3/apisix/cli/env.lua'
	no file '/usr/local/share/lua/5.1/apisix/cli/env.lua'
	no file '/usr/local/share/lua/5.1/apisix/cli/env/init.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/apisix/cli/env.lua'
	no file '/usr/local/openresty/luajit/share/lua/5.1/apisix/cli/env/init.lua'
	no file '/usr/local/apisix/deps/lib64/lua/5.1/apisix/cli/env.so'
	no file '/usr/local/apisix/deps/lib/lua/5.1/apisix/cli/env.so'
	no file './apisix/cli/env.so'
	no file '/usr/local/lib/lua/5.1/apisix/cli/env.so'
	no file '/usr/local/openresty/luajit/lib/lua/5.1/apisix/cli/env.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'
	no file '/usr/local/apisix/deps/lib64/lua/5.1/apisix.so'
	no file '/usr/local/apisix/deps/lib/lua/5.1/apisix.so'
	no file './apisix.so'
	no file '/usr/local/lib/lua/5.1/apisix.so'
	no file '/usr/local/openresty/luajit/lib/lua/5.1/apisix.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
	[C]: in function 'require'
	/usr/local/apisix/apisix/cli/apisix.lua:31: in main chunk
	[C]: at 0x00404d60

Environment

• apisix version (cmd: apisix version):
• OS: CentOS 7, 3.10.0-1160.15.2.el7.x86_64 change: added doc of how to load plugin. #1 SMP Wed Feb 3 15:06:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
• OpenResty / Nginx version: openresty/1.19.3.1
• etcd version: 3.4.13
• apisix-dashboard version, if have:

Minimal test code / Steps to reproduce the issue

1. Install APISIX from source code
2. $ apisix start

What's the actual result? (including assertion message & call stack if applicable)

Just checked the source, the line below is missing in the file apisix/cli/apisix.lua:

What's the expected result?

[apchee]

package.path = "/usr/local/apisix/?.lua;" .. package.path

[spacewander]

If you install APISIX from source, run ./bin/apisix start instead.

[spacewander]

Please read the https://github.com/apache/apisix#configure-and-installation, "Source code compilation"