[docker] \tendermint#9073 enable cross platform build using docker bu…

…ildx

DOCKER/Dockerfile

@@ -1,11 +1,11 @@
 # stage 1 Generate Tendermint Binary
-FROM golang:1.17-alpine as builder
+FROM --platform=$BUILDPLATFORM golang:1.17-alpine as builder
 RUN apk update && \
     apk upgrade && \
     apk --no-cache add make git
 COPY / /tendermint
 WORKDIR /tendermint
-RUN make build-linux
+RUN TARGETPLATFORM=$TARGETPLATFORM make build-linux
 
 # stage 2
 FROM golang:1.17-alpine

Makefile

@@ -15,6 +15,68 @@ LD_FLAGS = -X github.com/tendermint/tendermint/version.TMVersion=$(VERSION)
 BUILD_FLAGS = -mod=readonly -ldflags "$(LD_FLAGS)"
 CGO_ENABLED ?= 0
 
+# Process Docker environment varible TARGETPLATFORM 
+# in order to build binary with correspondent ARCH
+# by default will always build for linux/amd64
+# eg: docker buildx build --platform linux/arm64,linux/amd64 -f DOCKER/Dockerfile -t tendermint/tendermint:v0.35.4 --push --progress plain .
+TARGETPLATFORM ?= 
+GOOS ?= linux
+GOARCH ?= amd64
+GOARM ?=
+
+ifeq (linux/arm,$(findstring linux/arm,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=arm
+	GOARM=7
+endif
+
+ifeq (linux/arm/v6,$(findstring linux/arm/v6,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=arm
+	GOARM=6
+endif
+
+ifeq (linux/arm64,$(findstring linux/arm64,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=arm64
+	GOARM=7
+endif
+
+ifeq (linux/386,$(findstring linux/386,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=386
+endif
+
+ifeq (linux/amd64,$(findstring linux/amd64,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=amd64
+endif
+
+ifeq (linux/mips,$(findstring linux/mips,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=mips
+endif
+
+ifeq (linux/mipsle,$(findstring linux/mipsle,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=mipsle
+endif
+
+ifeq (linux/mips64,$(findstring linux/mips64,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=mips64
+endif
+
+ifeq (linux/mips64le,$(findstring linux/mips64le,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=mips64le
+endif
+
+ifeq (linux/riscv64,$(findstring linux/riscv64,$(TARGETPLATFORM)))
+	GOOS=linux
+	GOARCH=riscv64
+endif
+
 # handle nostrip
 ifeq (,$(findstring nostrip,$(TENDERMINT_BUILD_OPTIONS)))
   BUILD_FLAGS += -trimpath
@@ -269,7 +331,7 @@ testdata-metrics:
 
 # Build linux binary on other platforms
 build-linux:
-	GOOS=linux GOARCH=amd64 $(MAKE) build
+	GOOS=$(GOOS) GOARCH=$(GOARCH) GOARM=$(GOARM) $(MAKE) build
 .PHONY: build-linux
 
 build-docker-localnode: