Add nextcloud

nextcloud/.env.example

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+NEXTCLOUD_DATA_DIR=

nextcloud/docker-compose.yml

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+services:
+  nextcloud-aio-mastercontainer:
+    image: nextcloud/all-in-one:v10.9.0
+    init: true
+    restart: always
+    container_name: nextcloud-aio-mastercontainer # This line is not allowed to be changed as otherwise AIO will not work correctly
+    volumes:
+      - ${NEXTCLOUD_DATA_DIR}:/mnt/docker-aio-config # This line is not allowed to be changed as otherwise the built-in backup solution will not work
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+    network_mode: bridge # add to the same network as docker run would do
+    ports:
+      - 8081:8080
+      - 8443:8443