Dockerless builds for npm

This demonstrates a simple Node.js app that is built into a container image and pushed to a registry without needing Docker.

Usage

Set the DOCKER_REPO env var to a Docker/OCI repository you have push access to.

export DOCKER_REPO=gcr.io/my-project/test

$ npm run image
...
gcr.io/my-project/test/node-image-test@sha256:cdef7514faa3efb8e71ad96e27da2592464e2673babdde095eb1ab68ad5ff200

You can docker run the image directly, with --silent:

$ docker run $(npm run --silent image)
...
Unable to find image 'gcr.io/my-project/test/node-image-test@sha256:cdef7514faa3efb8e71ad96e27da2592464e2673babdde095eb1ab68ad5ff200' locally
...
Status: Downloaded newer image for gcr.io/my-project/test/node-image-test@sha256:cdef7514faa3efb8e71ad96e27da2592464e2673babdde095eb1ab68ad5ff200
hello

By default the base image is node:alpine. You can select a different base image with the BASE env var, e.g., BASE=node:buster npm run image

Caveats

• ⚠️ This runs npm install in your developer environment -- not in a container -- and malicious build scripts in dependencies can wreck your environment! Vet your dependencies.

• This only supports linux/amd64 for now. If this becomes a real thing I image it would support multi-arch builds fairly easily. Maybe even Windows?!