feat: Adds portainer and portainer agent.

portainer/README.md

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+# Portainer
+
+Portainer is a container orchestration tool / interface that gives a web portal to view containers
+running on different machines.
+
+The primary `compose.yml` file is the primary portainer docker compose file, and is used for the
+primary portainer instance. The `agent-compose.yml` is used on other / extra machines that you would
+like to integrate into the primary portainer instance known as `environments`.

portainer/agent-compose.yml

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+networks:
+  proxy:
+    external: true
+
+services:
+  portainer_agent:
+    image: portainer/agent:latest
+    container_name: portainer_agent
+    restart: unless-stopped
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - /var/lib/docker/volumes:/var/lib/docker/volumes:
+    ports:
+      - 9001:9001
+    labels:
+      com.centurylink.watchtower.enable: true

portainer/compose.yml

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+networks:
+  proxy:
+    external: true
+
+services:
+  portainer:
+    image: portainer/portainer-ce:alpine-sts
+    container_name: portainer
+    restart: unless-stopped
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - ./data:/data
+    networks:
+      - proxy
+    ports:
+      - 9010:9000 # optional if behind reverse proxy.
+    labels:
+      com.centurylinklabs.watchtower.enable: true