Add webserver for arch repo and update nextcloud config

roles/arch-mirror-docker/files/arch-mirror/.env

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+COMPOSE_PROJECT_NAME=arch-mirror
+

roles/arch-mirror-docker/files/arch-mirror/docker-compose.yml

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+version: '2.2'
+
+networks:
+  proxy-tier:
+    external:
+      name: nginx-proxy
+
+services:
+  arch-mirror:
+    image: nginx:latest
+    expose:
+      - 80
+    environment:
+      - VIRTUAL_HOST=arch.banditlair.com
+      - VIRTUAL_NETWORK=nginx-proxy
+      - VIRTUAL_PORT=80
+    volumes:
+      - /srv/repo:/usr/share/nginx/html:ro
+    networks:
+      - proxy-tier
+    restart: always

roles/arch-mirror-docker/meta/main.yml

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+dependencies:
+  - nginx-proxy-docker

roles/arch-mirror-docker/tasks/main.yml

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+---
+- name: Copy Arch Linux mirror config
+  copy: src=arch-mirror dest={{docker_compose_files_folder}}
+- name: Start Arch mirror project
+  docker_service: project_src={{docker_compose_files_folder}}/arch-mirror state=present