Initial working version

.env.sample

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+TYPE=jupyter-lab
+
+DOMAIN=jupyter-lab.example.com
+
+## Domain aliases
+#EXTRA_DOMAINS=', `www.jupyter-lab.example.com`'
+LETS_ENCRYPT_ENV=production

compose.yml

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+---
+version: "3.8"
+
+services:
+  app:
+    image: jupyter/datascience-notebook:r-4.1.1
+    networks:
+      - proxy
+    environment:
+      - JUPYTER_ENABLE_LAB=yes
+    deploy:
+      restart_policy:
+        condition: on-failure
+      labels:
+        - "traefik.enable=true"
+        - "traefik.http.services.${STACK_NAME}.loadbalancer.server.port=8888"
+        - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`${EXTRA_DOMAINS})"
+        - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
+        - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
+        ## Redirect from EXTRA_DOMAINS to DOMAIN
+        #- "traefik.http.routers.${STACK_NAME}.middlewares=${STACK_NAME}-redirect"
+        #- "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLForceHost=true"
+        #- "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLHost=${DOMAIN}"
+    # healthcheck:
+    #   test: ["CMD", "curl", "-f", "http://localhost"]
+    #   interval: 30s
+    #   timeout: 10s
+    #   retries: 10
+    #   start_period: 1m
+
+networks:
+  proxy:
+    external: true