Split deployment configuration into multiple files

[nghialv]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

The following ISSUES will be created once got merged. If you want me to skip creating the issue, you can use /todo skip command.

Details

---

1. Add a validate to ensure this was configured or using the default value by service name.

https://github.com/pipe-cd/pipe/blob/a5cd14bad17992c17564443a3b4c2219c5153d3a/pkg/config/deployment_kubernetes.go#L116-L119

This was created by todo plugin since "TODO:" was found in a5cd14b when #560 was merged. cc: @nghialv.

[nghialv]

/cc @nakabonne

[pipecd-bot]

Some issues were detected while linting go source files in your changes.

[nghialv]

/todo skip

[pipecd-bot]

This pull request is APPROVED by nakabonne.

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.

[pipecd-bot]

Code coverage for golang is 20.76%. This pull request decreases coverage by -0.01%.

File	Function	Base	Head	Diff
pkg/config/deployment_kubernetes.go	KubernetesDeploymentSpec.GetStage	--	0.00%	+0.00%
pkg/config/deployment_kubernetes.go	KubernetesDeploymentSpec.Validate	--	100.00%	+100.00%
pkg/config/deployment_kubernetes.go	DetermineTrafficRoutingMethod	--	0.00%	+0.00%
pkg/config/deployment_kubernetes.go	K8sTrafficRoutingStageOptions.Percentages	--	0.00%	+0.00%
pkg/config/deployment_terraform.go	TerraformDeploymentSpec.GetStage	--	0.00%	+0.00%
pkg/config/deployment_terraform.go	TerraformDeploymentSpec.Validate	--	100.00%	+100.00%
pkg/config/deployment.go	KubernetesDeploymentSpec.GetStage	0.00%	--	+-0.00%
pkg/config/deployment.go	KubernetesDeploymentSpec.Validate	100.00%	--	-100.00%
pkg/config/deployment.go	TerraformDeploymentSpec.GetStage	0.00%	--	+-0.00%
pkg/config/deployment.go	TerraformDeploymentSpec.Validate	100.00%	--	-100.00%
pkg/config/deployment.go	DetermineTrafficRoutingMethod	0.00%	--	+-0.00%
pkg/config/deployment.go	K8sTrafficRoutingStageOptions.Percentages	0.00%	--	+-0.00%

[pipecd-bot]

failed to handle template rule examples

Details

Error: unabled to push rendered files to destination