When you run bun --bun run vite build, it outputs the files to the dist directory, which is the default directory for vite.

build.outDir

• Type: string
• Default: dist

But in your Dockerfile you try to copy the files from the /usr/src/app/build directory instead. The error message is self-explanatory:

  40 | >>> COPY --from=prerelease /usr/src/app/build .
--------------------
ERROR: failed to solve: ...: "/usr/src/app/build": not found

To resolve this, you can either:

• add --outDir build to RUN bun --bun run vite build line:

  RUN bun --bun run vite build --outDir build

• or replace /usr/src/app/build with /usr/src/app/dist.