Initial configuration and Dockerfile.

.forgejo/workflows/build.yaml

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+on:
+  push:
+    tags:
+      - "*"
+jobs:
+  build_docker:
+    runs-on: docker
+    container:
+      image: ghcr.io/actions-runner-controller/actions-runner-controller/actions-runner-dind
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/login-action@v3
+        with:
+          registry: docker.zeptotech.net
+          username: ${{ vars.DOCKER_REGISTRY_USERNAME }}
+          password: ${{ secrets.DOCKER_REGISTRY_PASSWORD }}
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: zeptotech/zig-yarn:${{ github.ref_name }}

Dockerfile

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+FROM node:alpine
+
+ADD https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz zig.tar.xz
+RUN tar xvf zig.tar.xz && mv zig-linux-x86_64-0.13.0 /zig