Deployment fails when the application git branch is changed

What happened:

Deployment fails when the application git branch is changed.

What you expected to happen:

No failure

How to reproduce it:

1. branch: launch PipeCD Agent for v2
2. ADD the application
3. Modify PipeCD Agent configuration (branch: main)
4. Verify that changes in main branch can be deployed
5. Delete branch: v2
6. The change in main branch is detected and deployed successfully
7. Restart PipeCD Agent
8. Main branch changes are detected, but deploy fails

Environment:

• piped version:
• control-plane version:
• Others:

jsonPayload: {
branch: "v2"
caller: "git/client.go:191"
error: "exit status 128"
eventTime: 1697503936.6423886
logger: "piped.piped"
message: "failed to clone from local"
out: "Cloning into '/tmp/workspace4070547661/fbd286cb-20ee-4c7b-8920-69663c42f6bd-planner-1664305497/target-deploysource/deploysource2595605295/repo'...
fatal: Remote branch v2 not found in upstream origin
"
remote: "git@github.com:kentakozuka/pipecd-play.git"
repo-id: "pipecd-play"
repo-path: "/tmp/workspace4070547661/fbd286cb-20ee-4c7b-8920-69663c42f6bd-planner-1664305497/target-deploysource/deploysource2595605295/repo"
serviceContext: {2}
stacktrace: "github.com/pipe-cd/pipecd/pkg/git.(*client).Clone
	/home/runner/work/pipecd/pipecd/pkg/git/client.go:191
github.com/pipe-cd/pipecd/pkg/app/piped/deploysource.(*gitSourceCloner).Clone
	/home/runner/work/pipecd/pipecd/pkg/app/piped/deploysource/sourcecloner.go:59
github.com/pipe-cd/pipecd/pkg/app/piped/deploysource.(*provider).prepare
	/home/runner/work/pipecd/pipecd/pkg/app/piped/deploysource/deploysource.go:146
github.com/pipe-cd/pipecd/pkg/app/piped/deploysource.(*provider).Get
	/home/runner/work/pipecd/pipecd/pkg/app/piped/deploysource/deploysource.go:92
github.com/pipe-cd/pipecd/pkg/app/piped/planner/kubernetes.(*Planner).Plan
	/home/runner/work/pipecd/pipecd/pkg/app/piped/planner/kubernetes/kubernetes.go:56
github.com/pipe-cd/pipecd/pkg/app/piped/controller.(*planner).Run
	/home/runner/work/pipecd/pipecd/pkg/app/piped/controller/planner.go:202
github.com/pipe-cd/pipecd/pkg/app/piped/controller.(*controller).startNewPlanner.func2
	/home/runner/work/pipecd/pipecd/pkg/app/piped/controller/controller.go:499"
}
labels: {4}
logName: "projects/pipecd/logs/stderr"
receiveTimestamp: "2023-10-17T00:52:21.597267065Z"
resource: {2}
severity: "ERROR"
timestamp: "2023-10-17T00:52:16.653773215Z"
}

Start with the failed clone in pkg/git/client.go:191 and trace the deploy-source flow through pkg/app/piped/deploysource/sourcecloner.go and deploysource.go. Reproduce the branch change and agent restart described in the issue, then verify that changes from the new branch are detected and deployed successfully without requesting the deleted branch.