feature: pouch run supports --env-file #2857

[lang710]

Ⅰ. Describe what this PR did

pouch run supports --env-file

Ⅱ. Does this pull request fix one issue?

fixes #2857

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

don't like

Ⅳ. Describe how to verify it

pouch run --env-file=/home/abc -d busybox top

b2f0df7176e9459441276c7470ad95ae701329b49ff2709344706316597ce639

[root@vm_centos pouch]# pouch exec b2f0df7176e9459441276c7470ad95ae701329b49ff2709344706316597ce639 env | grep env_var_name
env_var_name=another_value

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2863 into master will decrease coverage by 2.8%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2863      +/-   ##
==========================================
- Coverage   69.09%   66.29%   -2.81%     
==========================================
  Files         285      285              
  Lines       17844    17844              
==========================================
- Hits        12330    11830     -500     
- Misses       4114     4592     +478     
- Partials     1400     1422      +22

Flag	Coverage Δ
#criv1alpha2_test	38.96% <ø> (-0.05%)	⬇️
#integration_test_0	?
#integration_test_1	35.72% <ø> (-0.04%)	⬇️
#integration_test_2	36.48% <ø> (+0.01%)	⬆️
#integration_test_3	35.41% <ø> (-0.04%)	⬇️
#node_e2e_test	?
#unittest	28.53% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
hookplugins/containerplugin/update_hook.go	0% <0%> (-100%)	⬇️
cri/stream/remotecommand/websocket.go	0% <0%> (-81.54%)	⬇️
daemon/mgr/container_upgrade.go	0% <0%> (-65.1%)	⬇️
builder/exporter.go	0% <0%> (-62.5%)	⬇️
cri/stream/remotecommand/exec.go	36.66% <0%> (-43.34%)	⬇️
storage/plugins/plugins.go	25% <0%> (-25%)	⬇️
daemon/builder.go	56.25% <0%> (-18.75%)	⬇️
pkg/utils/random_string.go	63.63% <0%> (-18.19%)	⬇️
daemon/mgr/container_envs.go	0% <0%> (-15.79%)	⬇️
daemon/mgr/spec_linux.go	64.66% <0%> (-14.49%)	⬇️
... and 35 more

[pouchrobot]

We found this is your first time to contribute to pouch, @lang710
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[allencloud]

Thanks for your work. Could you please squash the commits into a single one and check the ci failures? @lang710