Add a stack for Prometheus node exporter

stack_orchestrator/data/compose/docker-compose-node-exporter.yml

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+version: '3.8'
+
+services:
+  node-exporter:
+    image: prom/node-exporter:latest
+    restart: unless-stopped
+    command:
+      - '--path.rootfs=/host'
+      - '--collector.systemd'
+      - '--collector.processes'
+    network_mode: host
+    pid: host
+    ports:
+      - 9100
+    volumes:
+      - '/:/host:ro,rslave'

stack_orchestrator/data/stacks/node-exporter/README.md

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+# node-exporter
+
+## Start the stack
+
+```bash
+laconic-so --stack node-exporter deploy up
+```
+
+* The host node's metrics can be accessed at `http://localhost:9100/metrics`
+
+## Clean up
+
+Stop the node-exporter running in background:
+
+```bash
+laconic-so --stack node-exporter deploy down
+```

stack_orchestrator/data/stacks/node-exporter/stack.yml

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+version: "0.1"
+name: node-exporter
+repos:
+containers:
+pods:
+  - node-exporter