feat(argo-cd): add VPA support for all components

[rd-michel]

Note

This contribution was developed with the assistance of GitHub Copilot (AI pair programming). The implementation, testing, and review were guided by a human maintainer.

What this PR does

Adds VerticalPodAutoscaler support for all Argo CD components. Previously only the application-controller had a VPA template. This PR extends it to the remaining components:

• argocd-server
• argocd-repo-server
• argocd-applicationset-controller
• argocd-notifications-controller
• dex
• redis
• argocd-commit-server

Each new VPA template follows the existing application-controller VPA template as a reference implementation.

Changes

• New templates: vpa.yaml for each of the 7 components listed above
• values.yaml: Added a vpa section after the pdb section for each component (same structure as controller.vpa):
  • enabled: false — disabled by default, fully backwards compatible
  • labels: {}
  • annotations: {}
  • updateMode: Initial
  • containerPolicy: {} (with commented examples)
• ci/vpa-values.yaml: New CI test values file enabling VPA for all components
• Chart.yaml: Version bump 9.4.17 → 9.4.18, artifacthub.io/changes updated
• README.md: Regenerated via helm-docs

Testing

All CI values files lint cleanly with helm lint:

ci/default-values.yaml           ✔
ci/dynamic-sharding-values.yaml  ✔
ci/extension-values.yaml         ✔
ci/external-redis-values.yaml    ✔
ci/ha-autoscaling-values.yaml    ✔
ci/ha-static-values.yaml         ✔
ci/vpa-values.yaml               ✔
ci/with-commit-server-values.yaml ✔

helm template with all VPA flags enabled produces valid VerticalPodAutoscaler resources for all 8 components.

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Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• I have created a separate pull request for each chart according to pull requests
• My build is green (troubleshooting builds).