build docker image with portable true, and no specific targetcpu

docker/pipeline/Dockerfile

@@ -39,8 +39,8 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
 WORKDIR /src
 
 # By default, build non-portable code, for the oldest CPU that supports AVX2
-ARG PORTABLE=FALSE
-ARG TARGET_CPU=haswell
+ARG PORTABLE=TRUE
+#ARG TARGET_CPU=haswell
 
 # Do not use `pip` from the Debian repository, but fetch it from PyPA.
 # This way, we are sure that the latest versions of `pip`, `setuptools`, and
@@ -69,7 +69,6 @@ RUN git -C casacore checkout ${CASACORE_COMMIT}
 RUN cmake \
     -DCMAKE_BUILD_TYPE:STRING=Release \
     -DPORTABLE=${PORTABLE} \
-    -DTARGET_CPU=${TARGET_CPU} \
     -H/src/casacore \
     -B/src/casacore/build \
     -G Ninja
@@ -82,7 +81,6 @@ RUN git -C LofarStMan checkout ${LOFARSTMAN_COMMIT}
 RUN cmake \
     -DCMAKE_BUILD_TYPE:STRING=Release \
     -DPORTABLE=${PORTABLE} \
-    -DTARGET_CPU=${TARGET_CPU} \
     -H/src/LofarStMan \
     -B/src/LofarStMan/build \
     -G Ninja
@@ -99,7 +97,6 @@ RUN cmake \
     -DBUILD_WITH_PYTHON=OFF \
     -DBUILD_TESTING=OFF \
     -DPORTABLE=${PORTABLE} \
-    -DTARGET_CPU=${TARGET_CPU} \
     -H/src/EveryBeam \
     -B/src/EveryBeam/build \
     -G Ninja
@@ -112,7 +109,6 @@ RUN git -C aoflagger checkout ${AOFLAGGER_COMMIT}
 RUN cmake \
     -DCMAKE_BUILD_TYPE:STRING=Release \
     -DPORTABLE=${PORTABLE} \
-    -DTARGET_CPU=${TARGET_CPU} \
     -H/src/aoflagger \
     -B/src/aoflagger/build \
     -G Ninja
@@ -139,7 +135,6 @@ RUN cmake \
     -DCMAKE_BUILD_TYPE:STRING=Release \
     -DBUILD_TESTING=OFF \
     -DPORTABLE=${PORTABLE} \
-    -DTARGET_CPU=${TARGET_CPU} \
     -DLIBDIRAC_PREFIX=/usr/local/ \
     -DMETADATA_COMPRESSION_DEFAULT=True \
     -H/src/DP3 \