Add secret for private git

[keigohtr]

What is this PR for?

Add Git SSH Key management function for accessing a private git repository.

This PR includes

• Use Kubernetes Secret to store Git SSH Key
• Add WebUI for Git SSH Key
• Add test

What type of PR is it?

Feature

What is the issue?

#76

How should this be tested?

Run unittest

[yoquankara]

It looks like you don't use encryption. Could you provide rationale for that decision?

[keigohtr]

@yoquankara Thank you for your review.
Kubernetes Client does encryption automatically.

        v1_secret = client.V1Secret(
            api_version="v1",
            kind="Secret",
            metadata=client.V1ObjectMeta(
                name=name,
                namespace=service_level,
                labels={"rekcurd-worker": "True", "id": application_model.application_id,
                        "name": application_model.application_name}
            ),
            string_data=string_data,
            type="Opaque")

And when we use them, we need to decode it -> https://github.com/rekcurd/dashboard/pull/94/files#diff-6e60f8497f16de75099b3715931c19c8R944

[yoquankara]

Base64 is simple to decode, so I wondered if it was better to add extra encryption as suggested here.

https://kubernetes.io/docs/concepts/configuration/secret/#risks
https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/

That said, encrypt data at rest is beta feature in v1.13 though. So we may consider it later.

[keigohtr]

@yoquankara Yes I think so too.
This is current Kubernetes spec, so they will improve secret in the future. I know this situation and I expect to use a better encryption algorithm like bcrypt in the future.

[yoquankara]

LGTM

I added #101 for later improvement

[keigohtr]

@yoquankara Thank you veeeeery much!! :)

[codecov-io]

Codecov Report

Merging #94 into master will increase coverage by 0.68%.
The diff coverage is 94.93%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   83.69%   84.38%   +0.68%     
==========================================
  Files          42       43       +1     
  Lines        2098     2235     +137     
==========================================
+ Hits         1756     1886     +130     
- Misses        342      349       +7

Impacted Files	Coverage Δ
rekcurd_dashboard/models/application.py	93.75% <ø> (ø)	⬆️
rekcurd_dashboard/apis/__init__.py	91.93% <100%> (+5.26%)	⬆️
rekcurd_dashboard/apis/common.py	100% <100%> (ø)	⬆️
rekcurd_dashboard/apis/api_application.py	100% <100%> (ø)	⬆️
rekcurd_dashboard/apis/api_project.py	98.66% <100%> (ø)	⬆️
rekcurd_dashboard/apis/api_kubernetes.py	88.7% <100%> (ø)	⬆️
rekcurd_dashboard/apis/api_service.py	96.25% <100%> (-2.49%)	⬇️
rekcurd_dashboard/apis/kubernetes_handler.py	84.09% <89.55%> (+1.14%)	⬆️
rekcurd_dashboard/apis/api_kubernetes_secret.py	98.33% <98.33%> (ø)
... and 1 more

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