added joplin config

DISCLAIMER: I don't use joplin anymore and this setup is from a bygone era

joplin/docker-compose.yml

@@ -0,0 +1,44 @@
+version: '3.8'
+
+services:
+    app:
+        environment:
+            - APP_BASE_URL=https://sub.domain.com
+            - APP_PORT=1337
+            - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+            - POSTGRES_USER=joplin
+            - POSTGRES_PORT=5432
+            - POSTGRES_HOST=db
+            - DB_CLIENT=pg
+            - VIRTUAL_HOST=sub.domain.com
+            - LETSENCRYPT_HOST=sub.domain.com
+            - VIRTUAL_PORT=1337
+
+        restart: unless-stopped
+        image: joplin/server:latest
+        networks:
+            - proxy-network
+            - backend
+        
+    db:
+        restart: unless-stopped
+        image: postgres:13.1
+        ports:
+            - "5432:5432"
+        volumes:
+            - joplin-data:/var/lib/postgresql/data
+        environment:
+            - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+            - POSTGRES_USER=joplin
+            - POSTGRES_DB=joplin
+
+        networks:
+            - backend
+
+volumes:
+    joplin-data:
+
+networks:
+    proxy-network:
+        external: true
+    backend: