Add docker support and github CR package workflow

[stefan-matic]

Summary:

• Add multi-stage Dockerfile that builds a static Go binary and packages it into a minimal Alpine image (~60MB)
• Add .dockerignore to keep the build context lean
• Add .github/workflows/docker.yml that builds multi-arch images (amd64/arm64) and publishes to GitHub Container Registry on pushes to main and version tags

Usage:

  docker run -it --rm \
    -v ~/.aws:/home/claws/.aws:ro \
    ghcr.io/clawscli/claws

Setup:

No manual configuration is required — the workflow uses the built-in GITHUB_TOKEN which has packages: write permission. After the first image is published, you may want to change the package visibility from private to public in the
https://github.com/orgs/clawscli/packages

Note on multi-arch builds:

The workflow currently builds for both linux/amd64 and linux/arm64. On free-tier GitHub Actions runners, the arm64 build runs under QEMU emulation which can take 30-45+ minutes. If build times are a concern, you could:

a. Remove linux/arm64 from the platforms list to build amd64 only
b. Use native arm64 runners (e.g. ubuntu-24.04-arm, available on paid plans or for public repos)
c. Use cross-compilation instead of QEMU — Go natively cross-compiles without emulation. This requires restructuring the Dockerfile to build outside Docker and copy the binary in, which loses the multi-stage simplicity.

[yimsk]

Thanks for this, looks great!

Since claws is pure Go (CGO_ENABLED=0), I think we can avoid QEMU entirely by using Go's native cross-compilation. Something like this:

FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS build

WORKDIR /src

COPY go.mod go.sum ./
RUN go mod download

COPY . .

ARG VERSION=dev
ARG TARGETOS TARGETARCH

RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
    -ldflags="-s -w -X main.version=${VERSION}" \
    -o /claws ./cmd/claws

This way we wouldn't need to rely on QEMU at all.
k9s uses the same approach: https://github.com/derailed/k9s/blob/master/Dockerfile

[stefan-matic]

Yeah that sounds sane, lemme rework it

[stefan-matic]

Yup, you're right that's a lot faster (even disregarding the cache)!

Previously:

With the cross-compilation:

Thanks for teaching me something new :)

[yimsk]

This is awesome, thank you! 🎉
47min → 9min is a huge improvement. Merged and the image is now published at ghcr.io/clawscli/claws.