feat(infra): Upgrade infra layer to v0.2.1 for preview environment

[rebodutch]

This PR upgrades the safezone-infra umbrella chart and its dependencies to version 0.2.1, enabling the deployment of the complete infrastructure layer into our dynamic preview environment (safezone-preview).

It introduces new subcharts, updates shared configurations, adds required secrets for new platform services, and establishes a new CI workflow for static validation on Pull Requests.

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Key Changes

Helm Charts (/helm-charts)

• Upgraded safezone-infra Umbrella Chart to v0.2.1:
  • Added new required parameters for the cli-relay service.
  • Integrated redis-cache and time-server as new subcharts.
  • Updated the common _helpers.tpl and ConfigMap to include new shared parameters for platform services like Kafka and Redis Cache.

Preview Deployment & Secrets (/deploy/preview)

• Added and updated secrets for new dependencies:
  • Introduced new sealed secrets for Kafka and Redis Cache authentication.
  • Updated existing secrets (e.g., database, auth) to align with the v0.2.1 requirements.
  • Added helper scripts (seal.sh, install.sh) to streamline the process of sealing and applying these secrets for the preview environment.
• Updated Argo CD Application Manifest:
  • Modified deploy/preview/apps/safezone-infra.yaml to target the new v0.2.1 chart version, ensuring Argo CD can deploy the updated infrastructure to the safezone-preview namespace.

CI/CD (.github/workflows)

• Introduced pr-lint-and-validate.yml Workflow:
  • A new CI workflow has been added that triggers on Pull Requests to deploy/* branches.
  • It automatically performs static analysis on the changed Helm charts using helm lint and helm template --dry-run.
  • Upon completion, it posts a notification to the PR, informing the developer that the validation checks have passed and the corresponding Argo CD application is ready for manual sync/deployment.