helper script for fixing up repo size (#30028)

* small

* mv

scripts/build_small.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+set -ex
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd $DIR
+
+# git clone --mirror
+SRC=/tmp/openpilot.git/
+OUT=/tmp/smallpilot/
+
+echo "starting size $(du -hs .git/)"
+
+rm -rf $OUT
+
+cd $SRC
+git remote update
+
+# copy contents
+#rsync -a --exclude='.git/' $DIR $OUT
+
+cp -r $SRC $OUT
+
+cd $OUT
+
+# remove all tags
+git tag -l | xargs git tag -d
+
+# remove non-master branches
+BRANCHES="release2 dashcam dashcam3 release3 devel master-ci nightly"
+for branch in $BRANCHES; do
+  git branch -D $branch
+  git branch -D ${branch}-staging || true
+done
+
+#git gc
+git reflog expire --expire=now --all
+git gc --prune=now
+git gc --aggressive --prune=now
+echo "new one is $(du -hs .)"