Implement sealed-secrets namespace as ApplicationSet

[devin-ai-integration]

Implement sealed-secrets namespace as ApplicationSet

This PR implements the sealed-secrets namespace as an ArgoCD ApplicationSet, migrating from the current helmfile-based approach. This is the first step in exploring the migration path from helmfile to ApplicationSets.

Changes

• Created a new applicationsets directory to store the ApplicationSet implementations
• Implemented the sealed-secrets ApplicationSet with equivalent functionality to the current helmfile implementation
• Added documentation explaining the migration approach and implementation details

Implementation Details

The sealed-secrets namespace was chosen as the first migration target due to its simplicity:

• Single component deployment (sealed-secrets controller)
• Simple configuration with minimal templating
• No complex feature flags or scaling parameters

Testing

The implementation was tested in a local kind cluster with ArgoCD installed:

1. Created a kind cluster: kind create cluster --name argo-test
2. Installed ArgoCD: kubectl create namespace argocd && kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
3. Applied the ApplicationSet: kubectl apply -f applicationsets/sealed-secrets/applicationset.yaml -n argocd
4. Verified the Application was created and synced successfully
5. Confirmed the sealed-secrets controller was deployed correctly in the sealed-secrets namespace

Key Findings

• ApplicationSets can successfully replace helmfile for deploying Helm charts
• The helm.values field must be properly formatted as a YAML string using the pipe character
• The CreateNamespace=true sync option is needed to automatically create the namespace
• Automated sync policy ensures the Application syncs correctly

Link to Devin run

https://app.devin.ai/sessions/2cb304d98fe04b0fb664c404b6de176f

Requested by: Chris Wessels ([email protected])

[devin-ai-integration]

Original prompt from Chris:

@Devin Look carefully at the graphops/launchpad-namespaces repo. It uses helmfile to create packages of applications. Carefully analyze the capabilities of launchpad-namespaces today. Then do a careful analysis of ArgoCD ApplicationSets as an alternative. How seamlessly could we migrate a launchpad-namespace to an applicationset?

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