publish/distribute consul-alerts as a compressed .tgz (#244)

this allow nomad to use go-getter to download and run consul-alerts. ATM nomad is unable to unarchive the `.tar` distribution.

Makefile

@@ -40,7 +40,7 @@ build-all: test
 package: build-all
 	@echo "--> Packaging application"
 	@for arch in ${BUILD_ARCHS}; do \
-		tar cf build/tar/${APP_NAME}-${VERSION}-$${arch}.tar -C build/bin/$${arch}/${VERSION} ${APP_NAME} ; \
+		tar czf build/tar/${APP_NAME}-${VERSION}-$${arch}.tgz -C build/bin/$${arch}/${VERSION} ${APP_NAME} ; \
 	done
 
 release: package
@@ -51,11 +51,11 @@ ifeq ($(VERSION) , latest)
 endif
 	@echo "--> Releasing version: ${VERSION}"
 	@for arch in ${BUILD_ARCHS}; do \
-		curl -s -T "build/tar/${APP_NAME}-${VERSION}-$${arch}.tar" -u "${ACCESS_KEY}" "https://api.bintray.com/content/darkcrux/generic/${APP_NAME}/${VERSION}/${APP_NAME}-${VERSION}-$${arch}.tar"; \
+		curl -s -T "build/tar/${APP_NAME}-${VERSION}-$${arch}.tgz" -u "${ACCESS_KEY}" "https://api.bintray.com/content/darkcrux/generic/${APP_NAME}/${VERSION}/${APP_NAME}-${VERSION}-$${arch}.tgz"; \
 		echo "... $${arch}"; \
 	done
 	@echo "--> Publishing version ${VERSION}"
 	@curl -s -X POST -u ${ACCESS_KEY} https://api.bintray.com/content/darkcrux/generic/${APP_NAME}/${VERSION}/publish
 	@echo
 	@echo "Github Release"
-	@gh-release create AcalephStorage/consul-alerts ${VERSION}
+	@gh-release create AcalephStorage/consul-alerts ${VERSION}