Add observability stack with Grafana, Prometheus, Loki, and cAdvisor

- Introduced a new Grafana dashboard for monitoring Docker containers using cAdvisor.
- Created provisioning files for Grafana dashboards and data sources.
- Added Dockerfiles and configuration files for Loki and Prometheus.
- Implemented a Docker Compose stack for the observability services.
- Configured Traefik as a reverse proxy for the services with appropriate routing.
- Added scripts for SSH tunneling to access the telemetry dashboard.
- Included secrets management for Grafana admin credentials.

observability/grafana/Dockerfile

@@ -0,0 +1,11 @@
+FROM grafana/grafana:latest
+
+# Disable Grafana sign up option
+ENV GF_USERS_ALLOW_SIGN_UP=false
+
+# Copy local Grafana config and provisioning into the image
+COPY grafana.ini /etc/grafana/grafana.ini
+COPY provisioning/ /etc/grafana/provisioning/
+
+# Switch back to Grafana user and keep default entrypoint/CMD
+EXPOSE 3000