Multi-arch Docker push: amd64 + arm64 with manifest

- Dockerfile.static: takes pre-built binary, no compilation
- push-docker.sh: downloads x86_64 from CI release, builds arm64
  natively, creates multi-arch manifest and pushes both
- docker pull works on both Intel and Apple Silicon / RPi

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile.static

@@ -0,0 +1,18 @@
+# Minimal image from a pre-built static binary
+# Usage: docker build -f Dockerfile.static --build-arg BINARY=dist/btest .
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG BINARY=dist/btest
+COPY ${BINARY} /usr/local/bin/btest
+RUN chmod +x /usr/local/bin/btest
+
+EXPOSE 2000/tcp
+EXPOSE 2001-2100/udp
+EXPOSE 2257-2356/udp
+
+ENTRYPOINT ["btest"]
+CMD ["-s"]

scripts/push-docker.sh

@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
-# Build and push Docker image to Gitea registry.
-# Run on a machine with Docker (your Mac).
+# Build and push multi-arch Docker images to Gitea registry.
+#
+# Prerequisites:
+#   - dist/btest-linux-x86_64.tar.gz (from CI release or scripts/build-linux.sh)
+#   - Native macOS binary (built automatically)
 #
 # Usage:
 #   ./scripts/push-docker.sh v0.1.0
@@ -16,32 +19,90 @@ if [[ -f .env ]]; then
 fi
 
 TAG="${1:?Usage: $0 <tag>  (e.g. v0.1.0)}"
-REGISTRY="${GITEA_URL:-https://git.manko.yoga}"
-REGISTRY_HOST="${REGISTRY#https://}"
+REGISTRY_HOST="${GITEA_URL:-https://git.manko.yoga}"
+REGISTRY_HOST="${REGISTRY_HOST#https://}"
 REGISTRY_HOST="${REGISTRY_HOST#http://}"
 IMAGE="${REGISTRY_HOST}/manawenuz/btest-rs"
 
-echo "=== Building Docker image for ${IMAGE}:${TAG} ==="
-
-# Build the image
-docker build -t "${IMAGE}:${TAG}" -t "${IMAGE}:latest" .
-
-echo ""
-echo "=== Pushing to ${REGISTRY_HOST} ==="
-
-# Login if needed (uses GITEA_USER + GITEA_TOKEN from .env)
+# Login
 if [[ -n "${GITEA_TOKEN:-}" ]]; then
-    DOCKER_USER="${GITEA_USER:?Set GITEA_USER in .env (your Gitea username)}"
+    DOCKER_USER="${GITEA_USER:?Set GITEA_USER in .env}"
     echo "${GITEA_TOKEN}" | docker login "${REGISTRY_HOST}" -u "${DOCKER_USER}" --password-stdin
 fi
 
-docker push "${IMAGE}:${TAG}"
-docker push "${IMAGE}:latest"
+mkdir -p dist/docker-amd64 dist/docker-arm64
+
+# --- x86_64 binary ---
+if [[ ! -f dist/docker-amd64/btest ]]; then
+    if [[ -f dist/btest-linux-x86_64.tar.gz ]]; then
+        echo "Extracting x86_64 binary from tarball..."
+        tar xzf dist/btest-linux-x86_64.tar.gz -C dist/docker-amd64/
+    else
+        echo "No x86_64 binary found. Downloading from release ${TAG}..."
+        GITEA_URL_FULL="https://${REGISTRY_HOST}"
+        RELEASE_URL=$(curl -sf \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            "${GITEA_URL_FULL}/api/v1/repos/manawenuz/btest-rs/releases/tags/${TAG}" \
+            | jq -r '.assets[] | select(.name=="btest-linux-x86_64.tar.gz") | .browser_download_url')
+        if [[ -n "$RELEASE_URL" ]]; then
+            curl -sL "$RELEASE_URL" | tar xz -C dist/docker-amd64/
+        else
+            echo "Error: Cannot find x86_64 binary. Run CI first or scripts/build-linux.sh"
+            exit 1
+        fi
+    fi
+fi
+
+# --- arm64 binary (native build on Apple Silicon) ---
+if [[ ! -f dist/docker-arm64/btest ]]; then
+    echo "Building native arm64 binary..."
+    cargo build --release
+    cp target/release/btest dist/docker-arm64/btest
+fi
 
 echo ""
-echo "Done! Images pushed:"
-echo "  ${IMAGE}:${TAG}"
-echo "  ${IMAGE}:latest"
+echo "=== Building amd64 image ==="
+docker build --platform linux/amd64 -f Dockerfile.static \
+    --build-arg BINARY=dist/docker-amd64/btest \
+    -t "${IMAGE}:${TAG}-amd64" .
+
+echo ""
+echo "=== Building arm64 image ==="
+docker build --platform linux/arm64 -f Dockerfile.static \
+    --build-arg BINARY=dist/docker-arm64/btest \
+    -t "${IMAGE}:${TAG}-arm64" .
+
+echo ""
+echo "=== Pushing ==="
+docker push "${IMAGE}:${TAG}-amd64"
+docker push "${IMAGE}:${TAG}-arm64"
+
+# Create and push multi-arch manifest
+echo ""
+echo "=== Creating multi-arch manifest ==="
+docker manifest create "${IMAGE}:${TAG}" \
+    "${IMAGE}:${TAG}-amd64" \
+    "${IMAGE}:${TAG}-arm64" 2>/dev/null || \
+docker manifest create --amend "${IMAGE}:${TAG}" \
+    "${IMAGE}:${TAG}-amd64" \
+    "${IMAGE}:${TAG}-arm64"
+
+docker manifest push "${IMAGE}:${TAG}"
+
+# Tag as latest
+docker manifest create "${IMAGE}:latest" \
+    "${IMAGE}:${TAG}-amd64" \
+    "${IMAGE}:${TAG}-arm64" 2>/dev/null || \
+docker manifest create --amend "${IMAGE}:latest" \
+    "${IMAGE}:${TAG}-amd64" \
+    "${IMAGE}:${TAG}-arm64"
+
+docker manifest push "${IMAGE}:latest"
+
+echo ""
+echo "Done! Multi-arch images pushed:"
+echo "  ${IMAGE}:${TAG}      (amd64 + arm64)"
+echo "  ${IMAGE}:latest      (amd64 + arm64)"
 echo ""
 echo "Run with:"
 echo "  docker run --rm -p 2000:2000 -p 2001-2100:2001-2100/udp ${IMAGE}:${TAG} -s -v"