🐳 Add Dockerfile to create image with local code

docker/images/n8n-custom/Dockerfile

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+# 1. Create an image to build n8n
+FROM node:12.16-alpine as builder
+
+# Update everything and install needed dependencies
+USER root
+
+# Install all needed dependencies
+RUN apk --update add --virtual build-dependencies python build-base ca-certificates && \
+	npm_config_user=root npm install -g lerna
+
+WORKDIR /data
+
+COPY lerna.json .
+COPY package.json .
+COPY packages/cli/ ./packages/cli/
+COPY packages/core/ ./packages/core/
+COPY packages/editor-ui/ ./packages/editor-ui/
+COPY packages/nodes-base/ ./packages/nodes-base/
+COPY packages/workflow/ ./packages/workflow/
+RUN rm -rf node_modules packages/*/node_modules packages/*/dist
+
+RUN npm install --production --loglevel notice
+RUN lerna bootstrap --hoist -- --production
+RUN npm run build
+
+
+# 2. Start with a new clean image with just the code that is needed to run n8n
+FROM node:12.16-alpine
+
+USER root
+
+RUN apk add --update graphicsmagick tzdata tini su-exec
+
+WORKDIR /data
+
+# Install all needed dependencies
+RUN npm_config_user=root npm install -g full-icu
+
+ENV NODE_ICU_DATA /usr/local/lib/node_modules/full-icu
+
+COPY --from=builder /data ./
+
+COPY docker/images/n8n-custom/docker-entrypoint.sh /docker-entrypoint.sh
+ENTRYPOINT ["tini", "--", "/docker-entrypoint.sh"]

docker/images/n8n-custom/README.md

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+# n8n - Custom Image
+
+Dockerfile which allows to package up the local n8n code into
+a docker image.
+
+
+## Usage
+
+Execute the following in the n8n root folder:
+```bash
+docker build -t n8n-custom -f docker/images/n8n-custom/Dockerfile .
+```

docker/images/n8n-custom/docker-entrypoint.sh

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+#!/bin/sh
+
+if [ -d /root/.n8n ] ; then
+  chmod o+rx /root
+  chown -R node /root/.n8n
+  ln -s /root/.n8n /home/node/
+fi
+
+if [ "$#" -gt 0 ]; then
+  # Got started with arguments
+	shift
+  exec su-exec node ./packages/cli/bin/n8n "$@"
+else
+  # Got started without arguments
+  exec su-exec node ./packages/cli/bin/n8n
+fi