create Makefile target for linux64

Makefile

@@ -1,33 +1,44 @@
 VERSION=0.5.0
 PATH_BUILD=build/
 FILE_COMMAND=terragrunt-atlantis-config
-FILE_ARCH=darwin_amd64
+FILE_ARCH_DARWIN=darwin_amd64
+FILE_ARCH_LINUX=linux_amd64
 S3_BUCKET_NAME=cloudfront-origin-homebrew-tap-transcend-io
 PROFILE=transcend-prod
 
 clean:
 	rm -rf ./build
 	rm -rf '$(HOME)/bin/$(FILE_COMMAND)'
 
-build: clean
+build-darwin64: clean
 	@$(GOPATH)/bin/goxc \
     -bc="darwin,amd64" \
     -pv=$(VERSION) \
     -d=$(PATH_BUILD) \
     -build-ldflags "-X main.VERSION=$(VERSION)"
 
+build-linux64: clean
+	@$(GOPATH)/bin/goxc \
+    -bc="linux,amd64" \
+    -pv=$(VERSION) \
+    -d=$(PATH_BUILD) \
+    -build-ldflags "-X main.VERSION=$(VERSION)"
+
 test:
 	go test -v ./...
 
 version:
 	@echo $(VERSION)
 
-shasum:  build
-	shasum -a256 $(PATH_BUILD)$(VERSION)/$(FILE_COMMAND)_$(VERSION)_$(FILE_ARCH).zip
+shasum-darwin64:  build-darwin64
+	shasum -a256 $(PATH_BUILD)$(VERSION)/$(FILE_COMMAND)_$(VERSION)_$(FILE_ARCH_DARWIN).zip
+
+shasum-linux64:  build-linux64
+	shasum -a256 $(PATH_BUILD)$(VERSION)/$(FILE_COMMAND)_$(VERSION)_$(FILE_ARCH_LINUX).tar.gz
 
 install:
 	install -d -m 755 '$(HOME)/bin/'
-	install $(PATH_BUILD)$(VERSION)/$(FILE_ARCH)/$(FILE_COMMAND) '$(HOME)/bin/$(FILE_COMMAND)'
+	install $(PATH_BUILD)$(VERSION)/$(FILE_ARCH_DARWIN)/$(FILE_COMMAND) '$(HOME)/bin/$(FILE_COMMAND)'
 
 publish: build
 	AWS_PROFILE=$(PROFILE) aws s3 sync $(PATH_BUILD)/$(VERSION) s3://$(S3_BUCKET_NAME)/$(FILE_COMMAND)/$(VERSION)