Update Dockerfile

Dockerfile

@@ -1,9 +1,12 @@
 FROM ubuntu:22.04 as base
+ARG TARGETPLATFORM
 LABEL maintainer="Johannes Kalmbach <[email protected]>"
 ENV LANG C.UTF-8
 ENV LC_ALL C.UTF-8
 ENV LC_CTYPE C.UTF-8
 ENV DEBIAN_FRONTEND=noninteractive
+RUN echo "Building for platform ->$TARGETPLATFORM<-"
+RUN if [[ $TARGETPLATFORM -eq "linux/arm64"] ; then echo "target is ARM"; else echo "target is not ARM, probably AMD64"; fi
 RUN apt-get update && apt-get install -y software-properties-common wget && add-apt-repository -y ppa:mhier/libboost-latest
 RUN wget https://apt.kitware.com/kitware-archive.sh && chmod +x kitware-archive.sh &&./kitware-archive.sh
 
@@ -19,7 +22,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 WORKDIR /app/build/
 RUN cmake -DCMAKE_BUILD_TYPE=Release -DLOGLEVEL=INFO -DUSE_PARALLEL=true -D_NO_TIMING_TESTS=ON -GNinja ..
 RUN echo "Building for platform ->$TARGETPLATFORM<-"
-RUN if ["$TARGETPLATFORM" = "linux/arm64"] ; then cmake --build . --target IndexBuilderMain ServerMain; else cmake --build . ; fi
+RUN if [[ $TARGETPLATFORM -eq "linux/arm64"] ; then cmake --build . --target IndexBuilderMain ServerMain; else cmake --build . ; fi
 RUN ctest --rerun-failed --output-on-failure
 
 FROM base as runtime