feat(docker): reduce the size of alpine docker images (#3973)

* reduce redundant code between the two alpine Dockerfiles
* reduce the docker image build times
* reduce the `n8n` image size from 1.17GB to 462MB
* reduce the `n8n-custom` image size from 671MB to 460MB
* reduce the size of npm tree by making all typing packages devDependencies

Partially resolves this ticket: N8N-3252

docker/images/n8n-base/Dockerfile

@@ -0,0 +1,20 @@
+ARG NODE_VERSION=16
+FROM node:${NODE_VERSION}-alpine
+
+WORKDIR /home/node
+COPY .npmrc /usr/local/etc/npmrc
+
+RUN \
+	apk add --update graphicsmagick tini tzdata ca-certificates && \
+	npm install -g npm@latest full-icu && \
+	rm -rf /var/cache/apk/* /root/.npm /tmp/* && \
+	# Install fonts
+	apk --no-cache add --virtual fonts msttcorefonts-installer fontconfig && \
+	update-ms-fonts && \
+	fc-cache -f && \
+	apk del fonts && \
+	find  /usr/share/fonts/truetype/msttcorefonts/ -type l -exec unlink {} \; && \
+	rm -rf /var/cache/apk/* /tmp/*
+
+ENV NODE_ICU_DATA /usr/local/lib/node_modules/full-icu
+EXPOSE 5678/tcp