start for `curl openpilot.comma.ai | bash` (#32967)

* initial setup.sh for curl|bash

* --single-branch for faster pull and some final instructions

* fix git lfs pull
old-commit-hash: 122a7f2f0f

tools/setup.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [ ! -f launch_openpilot.sh ]; then
+  if [ ! -d openpilot ]; then
+    git clone --single-branch --recurse-submodules https://github.com/commaai/openpilot.git
+  fi
+  cd openpilot
+fi
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  tools/mac_setup.sh
+else
+  tools/ubuntu_setup.sh
+fi
+
+git lfs pull
+
+source .venv/bin/activate
+
+echo "Building openpilot"
+scons -u -j$(nproc)
+
+echo
+echo "----   OPENPILOT BUILDING DONE   ----"
+echo "To push changes to your fork, run the following commands:"
+echo "git remote remove origin"
+echo "git remote add origin git@github.com:<YOUR_USERNAME>/openpilot.git"
+echo "git fetch"
+echo "git commit -m \"first commit\""
+echo "git push"