Update Dockerfile

Dockerfile

@@ -1,12 +1,13 @@
 ARG NODE_VERSION=18
 FROM n8nio/base:${NODE_VERSION}
 
-ARG N8N_VERSION
+ARG N8N_VERSION=1.39.0
 RUN if [ -z "$N8N_VERSION" ] ; then echo "The N8N_VERSION argument is missing!" ; exit 1; fi
 
 ENV N8N_VERSION=${N8N_VERSION}
 ENV NODE_ENV=production
 ENV N8N_RELEASE_TYPE=stable
+ENV N8N_PORT= 7860
 RUN set -eux; \
 	npm install -g --omit=dev n8n@${N8N_VERSION} --ignore-scripts && \
 	npm rebuild --prefix=/usr/local/lib/node_modules/n8n sqlite3 && \