add Dockerfile

Dockerfile

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+FROM node:18-alpine as builder
+WORKDIR /app
+
+# install dependencies
+RUN apk add --update git bash
+ADD package.json package-lock.json /app
+RUN npm ci
+
+# build documentation
+ADD . /app
+#RUN npm run build
+
+# ---
+
+FROM node:18-alpine
+LABEL org.opencontainers.image.title="db-vendo-client"
+LABEL org.opencontainers.image.description="A clean REST API wrapping around the new Deutsche Bahn API."
+LABEL org.opencontainers.image.authors="Traines <git@traines.eu>"
+LABEL org.opencontainers.image.documentation="https://github.com/public-transport/db-vendo-client"
+LABEL org.opencontainers.image.source="https://github.com/public-transport/db-vendo-client"
+LABEL org.opencontainers.image.revision="6"
+LABEL org.opencontainers.image.licenses="ISC"
+WORKDIR /app
+
+# install dependencies
+ADD package.json /app
+RUN npm install --production && npm cache clean --force
+
+# add source code
+ADD . /app
+COPY --from=builder /app/docs ./docs
+
+EXPOSE 3000
+
+ENV HOSTNAME v6.db.transport.rest
+ENV PORT 3000
+
+VOLUME /logs/
+
+CMD ["node", "api.js"]