Support for specifying job environment variables

[leason00]

Fixes: #319

Signed-off-by: lisen lisen@youzan.com

[codecov]

Codecov Report

Merging #337 (a58c296) into master (5d81c7b) will increase coverage by 2.72%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
+ Coverage   76.58%   79.31%   +2.72%     
==========================================
  Files          24       23       -1     
  Lines        1764     1750      -14     
==========================================
+ Hits         1351     1388      +37     
+ Misses        335      278      -57     
- Partials       78       84       +6     

Flag	Coverage Δ
e2e	?
unit	79.31% <80.00%> (-0.54%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
controllers/configuration/configuration.go	95.40% <ø> (+2.33%)	⬆️
controllers/configuration/backend/kubernetes.go	76.10% <72.72%> (-6.51%)	⬇️
controllers/configuration_controller.go	77.35% <82.14%> (-0.36%)	⬇️
controllers/configuration/backend/backend.go	89.58% <100.00%> (+0.22%)	⬆️
controllers/provider/credentials.go	92.63% <100.00%> (ø)
controllers/provider/ucloud.go	100.00% <100.00%> (ø)
controllers/terraform/status.go	77.41% <100.00%> (ø)
e2e/normal/regression.go

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[chivalryq]

Can you illustrate why we need ProviderVariable in Configuration? How it is related to provider? What's the difference with Credentials in Provider?

[leason00]

Can you illustrate why we need ProviderVariable in Configuration? How it is related to provider? What's the difference with Credentials in Provider?

such as

provider "ucloud" {
  public_key  = "your_public_key"
  private_key = "your_private_key"
  project_id  = "your_project_id"
  region      = "cn-bj2"
}

If I want to create resources in different projects, I need to create multiple Provider。
Just like Region on Configuration. But Region is universal.
Ucloud project_id may not be so universal. so we need ProviderVariable

[zzxwill]

But we don't have a concept of Provider environment. How could it affect with the properties of a provider?

[leason00]

But we don't have a concept of Provider environment. How could it affect with the properties of a provider?

Add or overwrite

[leason00]

But we don't have a concept of Provider environment. How could it affect with the properties of a provider?

Otherwise, like Ucloud's PrjID, we need to create a lot of Provider, and the secret key is the same, only the PrjID is different, if you need to modify the key, this is a big project.

[chivalryq]

Would it be better if we extend a env fields for more general purpose? Maybe there are similar issues in the future.

[chivalryq]

LGTM after fix these.

[chivalryq]

Good job!