Add Firefly III personal finance manager

PostgreSQL backend, npm-network integration, uploads/db on /srv/firefly-iii/.

firefly-iii/.env.example

@@ -0,0 +1,6 @@
+# Generate with: openssl rand -hex 16 | head -c 32
+APP_KEY=
+
+APP_URL=https://firefly.kolpacksoftware.com
+
+DB_PASSWORD=

firefly-iii/docker-compose.yaml

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+services:
+  app:
+    image: fireflyiii/core:latest
+    container_name: firefly-iii
+    restart: unless-stopped
+    depends_on:
+      - db
+    environment:
+      - APP_KEY=${APP_KEY}
+      - APP_URL=${APP_URL}
+      - TRUSTED_PROXIES=**
+      - DB_CONNECTION=pgsql
+      - DB_HOST=db
+      - DB_PORT=5432
+      - DB_DATABASE=firefly
+      - DB_USERNAME=firefly
+      - DB_PASSWORD=${DB_PASSWORD}
+      - TZ=America/New_York
+    volumes:
+      - /srv/firefly-iii/upload:/var/www/html/storage/upload
+    ports:
+      - 8282:8080
+    networks:
+      - default
+      - internal
+
+  db:
+    image: postgres:16-alpine
+    container_name: firefly-iii-db
+    restart: unless-stopped
+    environment:
+      - POSTGRES_DB=firefly
+      - POSTGRES_USER=firefly
+      - POSTGRES_PASSWORD=${DB_PASSWORD}
+    volumes:
+      - /srv/firefly-iii/db:/var/lib/postgresql/data
+    networks:
+      - internal
+
+networks:
+  default:
+    external:
+      name: npm-network
+  internal:
+    driver: bridge