Refactor k8s provider to use shared git client instead of initializing a new one

[nghialv]

What this PR does / why we need it:

This will be required to allow configuring SSH key for remote Git Helm Chart repositories.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 31.76%. This pull request decreases coverage by -0.21%.

File	Function	Base	Head	Diff
pkg/app/api/grpcapi/piped_api.go	PipedAPI.UpdateApplicationConfigurations	--	0.00%	+0.00%
pkg/app/api/grpcapi/piped_api.go	PipedAPI.ReportUnregisteredApplicationConfigurations	--	0.00%	+0.00%
pkg/app/api/grpcapi/piped_api.go	PipedAPI.CreateDeploymentChain	--	0.00%	+0.00%
pkg/app/api/grpcapi/piped_api.go	PipedAPI.InChainDeploymentPlannable	--	0.00%	+0.00%
pkg/app/piped/apistore/environmentstore/store.go	Store.GetByName	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	fileSystem.Open	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	NewReporter	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.Run	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.scanAppConfigs	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.updateRegisteredApps	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.findRegisteredApps	--	83.33%	+83.33%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.updateUnregisteredApps	--	0.00%	+0.00%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.findUnregisteredApps	--	91.30%	+91.30%
pkg/app/piped/appconfigreporter/appconfigreporter.go	Reporter.readApplicationInfo	--	73.33%	+73.33%
pkg/app/piped/appconfigreporter/appconfigreporter.go	makeGitPathKey	--	100.00%	+100.00%
pkg/app/piped/cloudprovider/kubernetes/state.go	determineNameSpace	--	0.00%	+0.00%
pkg/app/piped/controller/controller.go	controller.shouldStartPlanningDeployment	--	0.00%	+0.00%
pkg/app/piped/trigger/deployment_chain.go	Trigger.triggerDeploymentChain	--	0.00%	+0.00%
pkg/app/piped/trigger/determiner.go	NewOnChainDeterminer	--	0.00%	+0.00%
pkg/app/piped/trigger/determiner.go	OnChainDeterminer.ShouldTrigger	--	0.00%	+0.00%
pkg/config/config.go	Kind.ToApplicationKind	--	100.00%	+100.00%
pkg/config/deployment.go	ChainApplicationMatcher.Validate	--	75.00%	+75.00%
pkg/datastore/deploymentchainstore.go	NewDeploymentChainStore	--	0.00%	+0.00%
pkg/datastore/deploymentchainstore.go	deploymentChainStore.AddDeploymentChain	--	0.00%	+0.00%
pkg/datastore/deploymentchainstore.go	deploymentChainStore.UpdateDeploymentChain	--	0.00%	+0.00%
pkg/datastore/deploymentchainstore.go	deploymentChainStore.GetDeploymentChain	--	0.00%	+0.00%
pkg/model/application.go	IsApplicationConfigFile	--	100.00%	+100.00%
pkg/model/command.go	Command.IsSyncApplicationCmd	--	0.00%	+0.00%
pkg/model/command.go	Command.IsChainSyncApplicationCmd	--	0.00%	+0.00%
pkg/model/deployment.go	IsSuccessfullyCompletedDeployment	--	0.00%	+0.00%
pkg/model/deployment.go	Deployment.IsInChainDeployment	--	0.00%	+0.00%
pkg/app/piped/cloudprovider/kubernetes/state.go	determineResourceHealth	0.00%	0.00%	+0.00%
pkg/app/piped/planpreview/terraformdiff.go	builder.terraformDiff	0.00%	0.00%	+0.00%
pkg/app/piped/trigger/determiner.go	determiners.Determiner	0.00%	0.00%	+0.00%
pkg/app/piped/trigger/trigger.go	Trigger.checkRepoCandidates	0.00%	0.00%	+0.00%
pkg/app/piped/trigger/trigger.go	Trigger.listCommandCandidates	0.00%	0.00%	+0.00%
pkg/config/config.go	DecodeYAML	72.73%	81.82%	+9.09%
pkg/config/config.go	Config.GetGenericDeployment	0.00%	28.57%	+28.57%
pkg/app/piped/cloudprovider/kubernetes/kubernetes.go	provider.init	0.00%	0.00%	+0.00%
pkg/app/piped/controller/controller.go	controller.syncPlanners	0.00%	0.00%	+0.00%
pkg/app/piped/trigger/deployment.go	Trigger.triggerDeployment	0.00%	0.00%	+0.00%
pkg/config/config.go	Config.UnmarshalJSON	83.33%	91.67%	+8.33%
pkg/app/api/grpcapi/piped_api.go	PipedAPI.CreateDeployment	0.00%	0.00%	+0.00%
pkg/app/piped/cloudprovider/kubernetes/state.go	determineJobHealth	0.00%	0.00%	+0.00%
pkg/app/piped/cloudprovider/kubernetes/state.go	determinePersistentVolumeHealth	0.00%	0.00%	+0.00%
pkg/app/piped/cloudprovider/kubernetes/kubernetes.go	initSharedGitClient	0.00%	--	+-0.00%
pkg/config/deployment.go	DeploymentChainNode.Validate	75.00%	--	-75.00%

[nakabonne]

Nice. This will open up the possibility to be more flexible.
/lgtm

[khanhtc1202]

Way to go 🚀
/approve

[pipecd-bot]

This pull request is APPROVED by khanhtc1202.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.