feature: cli supports --env-file

[lang710]

Signed-off-by: Lang Chi 21860405@zju.edu.cn

Ⅰ. Describe what this PR did

pouch command 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？)

unit test

Ⅳ. Describe how to verify it

cat /home/abc

env_var_name=another_value

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

b2f0df7176e9459441276c7470ad95ae701329b49ff2709344706316597ce639

pouch exec b2f0df7176e9459441276c7470ad95ae701329b49ff2709344706316597ce639 env | grep env_var_name

env_var_name=another_value

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2869 into master will decrease coverage by 1.69%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2869     +/-   ##
========================================
- Coverage   69.09%   67.4%   -1.7%     
========================================
  Files         285     285             
  Lines       17844   17844             
========================================
- Hits        12330   12028    -302     
- Misses       4114    4409    +295     
- Partials     1400    1407      +7

Flag	Coverage Δ
#criv1alpha2_test	39% <ø> (ø)	⬆️
#integration_test_0	?
#integration_test_1	35.73% <ø> (-0.03%)	⬇️
#integration_test_2	36.52% <ø> (+0.05%)	⬆️
#integration_test_3	35.43% <ø> (-0.02%)	⬇️
#node_e2e_test	34.7% <ø> (-0.08%)	⬇️
#unittest	28.53% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
hookplugins/containerplugin/update_hook.go	0% <0%> (-100%)	⬇️
daemon/mgr/container_upgrade.go	0% <0%> (-65.1%)	⬇️
builder/exporter.go	0% <0%> (-62.5%)	⬇️
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%)	⬇️
storage/volume/driver/remote.go	51.78% <0%> (-14.29%)	⬇️
daemon/mgr/container_logs.go	68.75% <0%> (-13.75%)	⬇️
daemon/mgr/spec_linux.go	66.07% <0%> (-13.08%)	⬇️
... and 22 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! 🍻