Update DockerFile so that ownership of new files does not default to root

[Mpdreamz]

• check codegen again
• update to version of pull-request that no longer uses set-env
• remove_last_downloaded_version.txt and move it into temp directory
• run in docker as user not root so we do not have chown issues later
• update ownership in docker and no longer run as root

[github-actions]

The backport to 7.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-7.x 7.x
# Navigate to the new working tree
cd .worktrees/backport-7.x
# Create a new branch
git switch --create backport-5459-to-7.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 60f946000e6606520a65481ee41cb5f1ff281468
# Push it to GitHub
git push --set-upstream origin backport-5459-to-7.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-7.x

Then, create a pull request where the base branch is 7.x and the compare/head branch is backport-5459-to-7.x.