Add a full script version of git-sweep

with a smidge more resilience

local/bin/git-sweep

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+git branch --merged "$([[ "${1}" != "-f" ]] && git rev-parse HEAD)" |
+  grep -Ev '(^\*|^\s*(main|master|develop)$)' |
+  while read -r branch_name; do
+    git branch -d "${branch_name}"
+  done