fix: multi-stage Dockerfile, remove prebuilt — Go 1.26, alpine 3.21, GOPRIVATE for private deps

Dockerfile

@@ -1,5 +1,21 @@
-FROM alpine:3.20
+# syntax=docker/dockerfile:1
+FROM --platform=$BUILDPLATFORM golang:1.26-alpine AS builder
+
+RUN apk add --no-cache git ca-certificates
+
+ARG GITHUB_TOKEN
+RUN git config --global url."https://${GITHUB_TOKEN}@github.com/".insteadOf "https://github.com/"
+ENV GOPRIVATE=github.com/luxfi/*,github.com/hanzoai/*
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o mpcd ./cmd/mpcd
+
+FROM alpine:3.21
 RUN apk add --no-cache ca-certificates
-COPY mpcd /usr/local/bin/mpcd
-EXPOSE 8081
+COPY --from=builder /app/mpcd /usr/local/bin/mpcd
+EXPOSE 8081 9651 9800
 ENTRYPOINT ["mpcd"]

Dockerfile.prebuilt

@@ -1,7 +0,0 @@
-FROM alpine:3.20
-ARG TARGETARCH
-RUN apk add --no-cache ca-certificates
-COPY mpcd-linux-${TARGETARCH} /usr/local/bin/mpcd
-RUN chmod +x /usr/local/bin/mpcd
-EXPOSE 8081 9651 9800
-ENTRYPOINT ["mpcd"]