Invoke docker build with Bun shell so commands run correctly, and document default automation behavior.
Add prebuilt build images and a publish workflow to speed CI by reusing heavy dependencies.
Co-authored-by: Dax <mail@thdxr.com>
Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Co-authored-by: opencode <opencode@sst.dev>