Enhance the LFS sync script in release pipeline

This commit significantly extends the `sync-lfs.sh` script used in the release process. Rather than just switching LFS configurations and pulling/pushing, it now incorporates operations like creating a clone for branch, resetting changes, trapping exit signals and cleaning up.

This improvement enhances the reliability of synchronizing Large File Storage (LFS) objects between repositories by incorporating additional safety checks and informative echo statements. The shell script now also handles situations such as exiting in the midway more gracefully. This enhanced script is expected to provide a smoother and more reliable release process.

release/ci/sync-lfs.sh

@@ -1,7 +1,51 @@
 #!/usr/bin/env bash
-mv .lfsconfig .lfsconfig.bak
-mv .lfsconfig-comma .lfsconfig
-git lfs fetch --all; git lfs pull
-mv .lfsconfig .lfsconfig-comma
-mv .lfsconfig.bak .lfsconfig
-git lfs fetch --all; git lfs push --all origin
+# How to use: run from the root of the openpilot repository with the following command: ./release/ci/sync-lfs.sh
+
+# Set variables
+export their_repo="https://github.com/commaai/openpilot.git"
+export their_branch="master"
+export current_branch=$(git rev-parse --abbrev-ref HEAD)
+export our_lfs_url=${LFS_URL:-"https://gitlab.com/sunnypilot/public/sunnypilot-lfs.git/info/lfs"}
+export our_lfs_push_url=${LFS_PUSH_URL:-"ssh://git@gitlab.com/sunnypilot/public/sunnypilot-lfs.git"}
+
+echo "Syncing LFS objects from $their_repo:$their_branch to $our_lfs_url"
+echo "Pushing LFS objects to $our_lfs_push_url"
+
+# Function to reset to the current branch and perform a hard reset
+function reset_hard {
+    exit_status=$?
+    echo "Resetting to the current branch and performing a hard reset..."
+    git reset --hard
+    git switch $current_branch
+    exit $exit_status
+}
+
+# Set trap to ensure reset on exit
+trap reset_hard SIGINT SIGTERM EXIT
+
+# Add remote if it does not exist
+git remote add comma $their_repo 2>/dev/null || echo "Remote 'comma' already exists."
+
+# Fetch the specified branch from the remote
+git fetch comma $their_branch
+
+# Clean up old branch if it exists
+git branch -D ${their_branch}-upstream 2>/dev/null || echo "No old branch to clean up."
+
+# Checkout new branch based on the upstream branch
+git checkout -b ${their_branch}-upstream comma/$their_branch
+
+# Write the .lfsconfig directly
+cat <<EOL > .lfsconfig
+[lfs]
+    url = $our_lfs_url
+    pushurl = $our_lfs_push_url
+    locksverify = false
+EOL
+
+# Fetch all LFS objects and push them to the specified pushurl
+git lfs fetch --all
+git lfs push --all $our_lfs_push_url
+git restore .lfsconfig
+
+# Switch back to the current branch (handled by trap)