diff --git a/Dockerfile b/Dockerfile
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+# syntax=docker/dockerfile:1.6
+
+FROM gitea/act_runner:0.2.13
+USER root
+
+# ---- Install system dependencies ----
+RUN apk add --no-cache \
+    docker-cli \
+    docker-cli-buildx \
+    git \
+    bash \
+    curl \
+    ca-certificates \
+    qemu-user-static \
+    binfmt-support
+
+# ---- Enable BuildKit by default ----
+ENV DOCKER_BUILDKIT=1
+
+# ---- Ensure buildx is available ----
+RUN docker buildx version || true
+
+# ---- Install binfmt handlers for multiarch ----
+# This is required for arm64 builds on amd64
+RUN docker run --rm --privileged tonistiigi/binfmt --install all || true
+
+# ---- Create buildx builder ----
+RUN docker buildx create --name multiarch --use || docker buildx use multiarch
+
+# ---- Verify builder ----
+RUN docker buildx inspect --bootstrap || true
+
+USER runner