feat: Transfer charts using Docker Image

[pranavcracker]

Problem

The Helm charts for site-manager live directly in this repository, which means every chart change requires a manual copy into downstream distribution repositories. There is no automated way for consumers to pull a specific version of the charts without cloning the full repository or relying on a manual sync step.

Solution

Introduce a dedicated sm-charts-transfer image built from a minimal FROM scratch Dockerfile. This image contains only the Helm chart directory and is published automatically via the existing publish.yaml GitHub Actions workflow on every push to main and on every release tag — no new workflows or manual steps are required. Downstream consumers can pull a specific chart version by referencing the corresponding image tag.

Changes Introduced

• ci/docker-charts/Dockerfile — New FROM scratch image that packages charts/ into /charts inside the image, keeping the artifact size minimal.
• .github/workflows/publish.yaml — Added sm-charts-transfer to the existing build matrix so the image is built and pushed automatically alongside all other component images.
• charts/site-manager/values.yaml — Added missing default values: profile, MONITORING_ENABLED, DBAAS_ENABLED, and paasGeoMonitor.monitoring.serviceCIDRRegex.
• charts/site-manager/templates/ — Added ServiceMonitor, grafana-dashboard, and paas-geo-monitor-service-monitor templates for Prometheus/Grafana monitoring integration.
• charts/site-manager/resource-profiles/ — Added dev, small, medium, large, and prod resource profile definitions.

[alexarefev]

Why do we need to add the following part:

• charts/site-manager/templates/ — Added ServiceMonitor, grafana-dashboard, and paas-geo-monitor-service-monitor templates for Prometheus/Grafana monitoring integration.