Deployable of theia-backend

[glsp-bot]

I am currently working on cleaning up the docker image to be a small bundle with running ecore-glsp.
For this is copy basically the lib folder from browser-app into the docker image. This should provide me with all required files for the client application.
But I did not find something similar for the theia-backend: Currently I still need to install the whole @Theia stack via npm or yarn.
I am also copying generated files at src-gen or similar to the docker build.

```RUN npm install @theia/core; \ 
    npm install @theia/filesystem ; \
    npm install @theia/workspace ; \
    npm install @theia/process ; \
    npm install @theia/languages ; \
    npm install @theia/json ; \
    npm install @theia/terminal ; \
    npm install @theia/typescript; \
    npm install -g @theia/cli

COPY --from=builder /home/node/src/client/browser-app/lib ./lib
COPY --from=builder /home/node/src/client/browser-app/package.json .
COPY --from=builder /home/node/src/client/browser-app/src-gen ./src-gen
COPY --chown=node:node --from=builder /home/node/src/client/theia-ecore/lib/node ./node_modules/theia-ecore/lib/node
COPY --chown=node:node --from=builder /home/node/src/client/theia-ecore/lib/common ./node_modules/theia-ecore/lib/common```

As the list is getting longer and longer, it seems to be quite error prone and not very adaptable for future changes.
Is this backend (Basically everything what is in 'node' folders) bundled somewhere, so that theia start can run this directly?

original thread by Jonas Ebel

[glsp-bot]

[Jonas Ebel]

Want to reference this issue in theia/cli - this seems to be related: eclipse-theia/theia#4541