git.astralchroma.dev has a number of labels; each with minimal images for each purpose, avoiding the giant multi-gigabyte images used by GitHub and recommended by Act. The following labels are available:

Label	Available	Based on
alpine*	nodejs†	node:alpine
alpine-docker	nodejs†, docker-cli, docker-cli-buildx	node:alpine
alpine-java25	nodejs†, tar, temurin-25-jdk, zstd	eclipse-temurin:25-alpine

* Not in this repository, it is literally just the node:alpine image.

† Node.js is required by some Actions, most notably checkout.

-arm64 can be added to any label name to specify it should be run on arm64/aarch64 specifically.