Install instruction for develop are out off date

[GordianDziwis]

After mvn clean install there are no debian packages built to install.

FROM maven:3-jdk-11

ENV SHA=b50353b3eb0424197194732b9faac5ce7330159f

RUN apt-get update && apt-get install -y \
  default-jre-headless \
  jq

WORKDIR /app/
RUN git init
RUN git remote add origin https://github.com/SmartDataAnalytics/RdfProcessingToolkit.git
RUN echo $SHA
RUN git fetch --depth 1 origin $SHA
RUN git checkout FETCH_HEAD
RUN mvn clean install -DskipTests=true
RUN dpkg -i $(find . -name "rdf-processing-toolkit*.deb")

ENTRYPOINT [ "" ]
CMD [ "" ]