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.

.github/workflows/action-build-and-push.yaml

@@ -0,0 +1,71 @@
+name: Docker Build & Push to GitHub Container Registry (Use git tags with format vX.Y.Z as release version)
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        type: string
+        required: true
+        description: >
+          Docker image name without registry and owner.
+          Example: observability/alloy
+
+      build_context:
+        type: string
+        required: false
+        default: .
+        description: >
+          Path to the Docker build context.
+          Example: . or ./services/api
+
+      file_path:
+        type: string
+        required: false
+        default: ./Dockerfile
+        description: >
+          Path to the Dockerfile relative to the repository root.
+          Example: ./Dockerfile or ./services/api/Dockerfile
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Ensure lowercase username because some registries do not allow uppercase letters
+        id: lowercase
+        run: echo "username=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ steps.lowercase.outputs.username }}/${{ inputs.image_name }}
+          tags: |
+            type=match,pattern=.*(v\d+\.\d+\.\d+),group=1
+            type=match,pattern=.*(v\d+\.\d+)\.\d+,group=1
+            type=match,pattern=.*(v\d+)\.\d+\.\d+,group=1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ${{ inputs.build_context }}
+          file: ${{ inputs.file_path }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}