Update Dockerfile to adaption Cross-compiling

Author: MasonXon

Dockerfile

@@ -1,13 +1,16 @@
-FROM opencsg-registry.cn-beijing.cr.aliyuncs.com/opencsg_public/go-node AS build
+FROM --platform=$BUILDPLATFORM opencsg-registry.cn-beijing.cr.aliyuncs.com/opencsg_public/go-node AS builder
 RUN mkdir /myapp
 WORKDIR /myapp
 ADD . /myapp
 
+ENV CGO_ENABLED=0
 RUN go mod tidy
 RUN cd frontend && yarn install && yarn build
-RUN go build -o csghub-portal ./cmd/csghub-portal
+RUN GOOS=$(echo ${TARGETPLATFORM} | cut -f1 -d '/') \
+    GOARCH=$(echo ${TARGETPLATFORM} | cut -f2 -d '/') \
+    go build -o csghub-portal ./cmd/csghub-portal
 
 FROM bitnami/minideb:latest
 RUN apt update && apt install -y ca-certificates && update-ca-certificates
 WORKDIR /myapp
-COPY --from=build /myapp/csghub-portal /myapp/csghub-portal
+COPY --from=builder /myapp/csghub-portal /myapp/csghub-portal