Docker build no tests for ARM (#1599)

The cross-compilatiion currently takes more than 6 hours and is then cancelled by GitHub actions.
We thus disable the building and execution of unit tests for the ARM64 build.

Dockerfile

@@ -8,16 +8,21 @@ RUN apt-get update && apt-get install -y software-properties-common wget && add-
 RUN wget https://apt.kitware.com/kitware-archive.sh && chmod +x kitware-archive.sh &&./kitware-archive.sh
 
 FROM base as builder
+ARG TARGETPLATFORM
 RUN apt-get update && apt-get install -y build-essential cmake libicu-dev tzdata pkg-config uuid-runtime uuid-dev git libjemalloc-dev ninja-build libzstd-dev libssl-dev libboost1.81-dev libboost-program-options1.81-dev libboost-iostreams1.81-dev libboost-url1.81-dev
-
 COPY . /app/
 
 WORKDIR /app/
 ENV DEBIAN_FRONTEND=noninteractive
 
 WORKDIR /app/build/
-RUN cmake -DCMAKE_BUILD_TYPE=Release -DLOGLEVEL=INFO -DUSE_PARALLEL=true -D_NO_TIMING_TESTS=ON -GNinja .. && ninja
-RUN ctest --rerun-failed --output-on-failure
+RUN cmake -DCMAKE_BUILD_TYPE=Release -DLOGLEVEL=INFO -DUSE_PARALLEL=true -D_NO_TIMING_TESTS=ON -GNinja ..
+# When cross-compiling the container for ARM64, then compiling and running all tests runs into a timeout on GitHub actions,
+# so we disable tests for this platform.
+# TODO(joka921) re-enable these tests as soon as we can use a native ARM64 platform to compile the docker container.
+RUN if  [ $TARGETPLATFORM = "linux/arm64" ] ; then echo "target is ARM64, don't build tests to avoid timeout"; fi
+RUN if [ $TARGETPLATFORM = "linux/arm64" ] ; then cmake --build . --target IndexBuilderMain ServerMain; else cmake --build . ; fi
+RUN if [ $TARGETPLATFORM = "linux/arm64" ] ; then echo "Skipping tests for ARM64" ; else ctest --rerun-failed --output-on-failure ; fi
 
 FROM base as runtime
 WORKDIR /app