Fix: Docker build (#7582)

[jcobol]

Corrected the Dockerfile and .dockerignore to successfully build the excalidraw Docker image locally.

Tested locally by

• building the Docker image
• running the image using docker-compose
• connecting to Excalidraw and using some features

[vercel]

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Name	Status	Preview	Updated (UTC)
excalidraw	✅ Ready (Inspect)	Visit Preview	Mar 23, 2024 5:47pm
excalidraw-package-example	✅ Ready (Inspect)	Visit Preview	Mar 23, 2024 5:47pm
excalidraw-package-example-with-nextjs	✅ Ready (Inspect)	Visit Preview	Mar 23, 2024 5:47pm

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview	Mar 23, 2024 5:47pm

[scratchmex]

I was able to succesfully build the docker image from main with this fix. Thanks.

@dwelle this is a simple fix and I think this issue has been going on for a while. Is there a chance you can get a look into this? Thanks

[modem7]

Just an FYI, #7430 also covers fixing the build.

Mostly commenting so that the multiple PR's are linked so the best route forward can be merged.

[mathben]

I confirm this fix, works for me! Thanks.

[simarmannsingh]

Wow, this fix works for me for the linux/arm64 platform as well.
Worked like a charm.
This PR should be merged to master, as otherwise the master Docker deployment is broken.