Could not build a docker image

Steps to reproduce the bug

git clone https://git.scc.kit.edu/synergy.o3as/o3webapp.git
git checkout develop

Then

docker-compose build --no-cache

docker build --no-cache -t app:react .

Resulting and expected behaviour

...
> example-code@0.1.0 build
> react-scripts build

sh: react-scripts: not found
ERROR: Service 'app' failed to build: The command '/bin/sh -c npm run build' returned a non-zero code: 127

Expected: the docker image is built

System Information [if necessary]


Operating system (including version):	Linux Ubuntu Mate 20.04

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