Fix multi-arch Docker build without QEMU

.github/workflows/docker-image.yml

@@ -23,9 +23,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 

Dockerfile

@@ -1,6 +1,9 @@
 # syntax=docker/dockerfile:1
 
-FROM golang:1.24.4-alpine AS build
+FROM --platform=$BUILDPLATFORM golang:1.24.4-alpine AS build
+
+ARG TARGETOS
+ARG TARGETARCH
 
 WORKDIR /src
 
@@ -10,25 +13,18 @@ RUN --mount=type=cache,id=mc-gateway-go-mod,target=/go/pkg/mod,sharing=locked \
 
 COPY . .
 RUN --mount=type=cache,id=mc-gateway-go-mod,target=/go/pkg/mod,sharing=locked \
-    --mount=type=cache,id=mc-gateway-go-build,target=/root/.cache/go-build,sharing=locked \
-    CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /out/mc-gateway ./cmd/gateway
+    --mount=type=cache,id=mc-gateway-go-build-${TARGETOS}-${TARGETARCH},target=/root/.cache/go-build,sharing=locked \
+    mkdir -p /out \
+    && CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -ldflags="-s -w" -o /out/mc-gateway ./cmd/gateway
 
 FROM alpine:3.22
 
-RUN apk add --no-cache su-exec \
-    && addgroup -S mc-gateway \
-    && adduser -S -G mc-gateway mc-gateway
-
 WORKDIR /data
-RUN chown mc-gateway:mc-gateway /data
 
 COPY --from=build /out/mc-gateway /usr/local/bin/mc-gateway
-COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
-RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 
 ENV MC_GATEWAY_DB=/data/mc-gateway.sqlite3
 
 EXPOSE 25565/tcp
 
-ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
 CMD ["/usr/local/bin/mc-gateway"]

docker-entrypoint.sh

@@ -1,10 +0,0 @@
-#!/bin/sh
-set -eu
-
-if [ "$(id -u)" = "0" ]; then
-    mkdir -p /data
-    chown -R mc-gateway:mc-gateway /data
-    exec su-exec mc-gateway "$@"
-fi
-
-exec "$@"