Docker images for act

Ubuntu-based images for nektos/act, kept small while staying compatible with most GitHub Actions.

Images

Built from scripts/act.sh. Published to this repo’s Gitea registry:

• Registry: git.keligrubb.com
• Image: git.keligrubb.com/actions/ubuntu
• Tags: act-22.04, act-24.04, act-latest (and dated tags e.g. act-24.04-YYYYMMDD)
• Base image: buildpack-deps (overview, tags, source)

Build locally

You can build and push from this repo without using CI.

Prereqs: Docker with buildx, and push access to your registry (e.g. git.keligrubb.com).

1. Set env (repo root):

export IMAGE_LABEL_OWNER="actions"
export IMAGE_LABEL_REPO="ubuntu"
export SLUG="actions/ubuntu"

export DISTRO="ubuntu"
export TYPE="act"
export RUNNER="root"
export NODE="20 24"
export PLATFORMS="linux/amd64,linux/arm64"

export FROM_IMAGE="buildpack-deps"
export FROM_TAG="24.04"

export TAG="act-24.04"
export LATEST_TAG="act-latest"
export PART_TAG="$(date +%Y%m%d)"
export BUILD_TAG="${TAG}"
export BUILD_TAG_VERSION="${PART_TAG}"
export BUILD_REF="$(git rev-parse HEAD 2>/dev/null || echo unknown)"

2. Log in to your registry:

docker login git.keligrubb.com

3. Build and push:

tags=""
tags="${tags} git.keligrubb.com/${SLUG}:${TAG}-${PART_TAG}"
tags="${tags} git.keligrubb.com/${SLUG}:${LATEST_TAG}-${PART_TAG}"
tags="${tags} git.keligrubb.com/${SLUG}:${TAG}"
tags="${tags} git.keligrubb.com/${SLUG}:${LATEST_TAG}"

./build.sh --push --tags ${tags}

This builds the root Dockerfile (which runs scripts/act.sh), then pushes to each tag. For a local build only (no push), run ./build.sh.

4. Use with act

Point act at your image, e.g.:

act -P ubuntu-latest=git.keligrubb.com/actions/ubuntu:act-24.04

Or put the image in .actrc or your workflow’s runs-on image.

License

Parts of this repository are from actions/virtual-environments, used under the MIT License.