Fix CI cmake issue

Docker/Dockerfile-base

@@ -3,7 +3,7 @@ FROM ubuntu:20.04 as builder
 # This Docker image builds the dependencies for the Rapthor pipeline.
 # It lives on the head of its dependencies.
 
-# Install all build-time dependencies
+# Install all build-time dependencies (+pip for debugging)
 RUN export DEBIAN_FRONTEND=noninteractive && \
     apt-get update && \
     apt-get install -y \
@@ -37,6 +37,7 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
         python3 \
         python3-casacore \
         python3-numpy \
+        python3-pip \
         wcslib-dev \
         wget && \
     mkdir -p /src
@@ -93,9 +94,11 @@ RUN git clone --no-checkout \
     cmake .. && \
     make install -j`nproc`
 
+# added pip install cmake to get the newest cmake for Everybeam
 ARG EVERYBEAM_COMMIT=master
 RUN git clone --no-checkout \
         https://git.astron.nl/RD/EveryBeam.git && \
+    python3 -m pip install --upgrade cmake && \
     mkdir EveryBeam/build && \
     cd EveryBeam && git checkout ${EVERYBEAM_COMMIT} && \
     cd build && \