faster docker build

Dockerfile.frontend-artifact

@@ -0,0 +1,36 @@
+FROM golang:1.24-alpine AS backend-builder
+WORKDIR /app
+ARG TARGETARCH
+ENV CGO_ENABLED=1
+ENV CGO_CFLAGS="-D_LARGEFILE64_SOURCE"
+ENV GOARCH=$TARGETARCH
+
+RUN apk update && apk add --no-cache \
+    gcc \
+    musl-dev \
+    libc-dev \
+    make \
+    git \
+    wget \
+    unzip \
+    bash
+
+ENV CC=gcc
+
+COPY . .
+# Copy pre-built frontend files from a known location (provided by workflow artifact)
+COPY frontend_dist/ /app/web/html/
+
+RUN go build -ldflags="-w -s" \
+    -tags "with_quic,with_grpc,with_utls,with_acme,with_gvisor" \
+    -o sui main.go
+
+FROM --platform=$TARGETPLATFORM alpine
+LABEL org.opencontainers.image.authors="alireza7@gmail.com"
+ENV TZ=Asia/Tehran
+WORKDIR /app
+RUN apk add --no-cache --update ca-certificates tzdata
+COPY --from=backend-builder /app/sui /app/
+COPY entrypoint.sh /app/
+VOLUME [ "s-ui" ]
+ENTRYPOINT [ "./entrypoint.sh" ]