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)

When images are updated

Dependencies required for actions change
Changes to GitHub Actions, Act, or the container registry
Size or performance improvements

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.

Customising

Edit scripts/act.sh to add or remove packages. Keep DISTRO=ubuntu, TYPE=act, and a valid RUNNER user, then re-run the build steps above.

Licence

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

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