Add install gofumpt script

go/.local/bin/install-gofumpt

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+
+# shellcheck disable=SC1090
+source "${XDG_DATA_HOME}/buddy-up/includes/utils.sh"
+
+APP=gofumpt
+VERSION=${VERSION:-v0.5.0}
+DEST="${XDG_DATA_HOME}/apps/releases/${APP}"
+URL=https://github.com/mvdan/gofumpt/releases/download/${VERSION}/gofumpt_${VERSION}_$(get_os)_$(get_arch)
+
+extract_binary "${URL}" "${DEST}/${VERSION}/${APP}"
+set_current_link "${DEST}" "${VERSION}"
+set_link "${XDG_BIN_HOME}/${APP}" "${DEST}" "${APP}"