Improve GH Action Build Regen by building two times and having everyt…

[oscerd]

…hing generated in one shot

Fixes #797

[github-actions]

The backport to 0.7.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-0.7.x 0.7.x
# Navigate to the new working tree
cd .worktrees/backport-0.7.x
# Create a new branch
git switch --create backport-801-to-0.7.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick ---mainline 1 1fdc58bcfc5ba8e7f009e05dc99b8dd0a4e4f5f8
# Push it to GitHub
git push --set-upstream origin backport-801-to-0.7.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-0.7.x

Then, create a pull request where the base branch is 0.7.x and the compare/head branch is backport-801-to-0.7.x.