Dockerfile.aarch64 hinzugefügt

Dockerfile.aarch64

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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 \
+    nodejs \
+    npm \
+    docker-cli \
+    docker-cli-buildx \
+    git \
+    bash \
+    curl \
+    ca-certificates
+
+# ---- Enable BuildKit by default ----
+ENV DOCKER_BUILDKIT=1
+
+RUN docker buildx version || true