dev: docker-compose setup for prom2.

Copy of prometheus1 docker-compose config.

docker/blocks/prometheus2/docker-compose.yaml

+  prometheus:
+    build: blocks/prometheus2
+    network_mode: host
+    ports:
+      - "9090:9090"
+
+  node_exporter:
+    image: prom/node-exporter
+    network_mode: host
+    ports:
+      - "9100:9100"
+
+  fake-prometheus-data:
+    image: grafana/fake-data-gen
+    network_mode: host
+    ports:
+      - "9091:9091"
+    environment:
+      FD_DATASOURCE: prom
+
+  alertmanager:
+    image: quay.io/prometheus/alertmanager
+    network_mode: host
+    ports:
+      - "9093:9093"