fix(ci): add git install to Dockerfile (#2443)

Co-authored-by: Leo Schultheiß <leo.schultheiss@fau.de>

Dockerfile

@@ -1,4 +1,8 @@
 FROM node:22-slim AS builder
+
+# install git to install plugins
+RUN apt-get update && apt-get install -y git && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /usr/src/app
 COPY package.json .
 COPY package-lock.json* .