Deprecate makesourcedb (RAP-481)

DP3 accepts BBS-compatible skymodel files as input. A call of makesourcedb is not needed anymore. The corresponding ticket is RAP-481

Docker/Dockerfile-base

@@ -117,7 +117,7 @@ RUN git clone --no-checkout \
     mkdir DP3/build && \
     cd DP3 && git checkout ${DP3_COMMIT} && \
     cd build && \
-    cmake .. -DPORTABLE=${PORTABLE} && \
+    cmake .. -DPORTABLE=${PORTABLE} -DLIBDIRAC_PREFIX=/usr/local/ && \
     make install -j`nproc`
 
 ARG WSCLEAN_COMMIT=master