netdata/packaging: Fix broken netdata docker image for dbengine-enabled code (#6020)

1) Do not double COPY stuff at the second layer, that does not work like that. Install judy on / and move over just like we do with netdata to bring all over with one COPY
2) After you install judy, remove the stuff you bring in to make install command work for judy

The image has been tested with the latest fixes from the helper-images side.
This change should be merged in AFTER we merge in helper-images fix

packaging/docker/Dockerfile

@@ -5,7 +5,9 @@
 # It is automated in `build.sh` script
 ARG ARCH=amd64
 # This image contains preinstalled dependecies
-FROM netdata/builder:${ARCH} as builder 
+FROM netdata/builder:${ARCH} as builder
+
+ENV JUDY_VER 1.0.5
 
 # Copy source
 COPY . /opt/netdata.git
@@ -29,6 +31,7 @@ RUN mkdir -p /app/usr/sbin/ \
     mv /var/lib/netdata     /app/var/lib/ && \
     mv /etc/netdata         /app/etc/ && \
     mv /usr/sbin/netdata    /app/usr/sbin/ && \
+    mv /judy-${JUDY_VER}    /app/judy-${JUDY_VER} && \
     mv packaging/docker/run.sh        /app/usr/sbin/ && \
     chmod +x /app/usr/sbin/run.sh
 
@@ -51,7 +54,6 @@ RUN if [ "$(uname -m)" == "x86_64" ]; then \
 # Copy files over
 RUN mkdir -p /opt/src
 COPY --from=builder /app /
-COPY --from=builder /opt/src /opt/src
 
 # Configure system
 ARG NETDATA_UID=201
@@ -59,7 +61,9 @@ ARG NETDATA_GID=201
 RUN \
     # provide judy installation to base image
     apk add make alpine-sdk && \
-    cd /opt/src/judy-1.0.5 && make install && cd - && \
+    cd /judy-${JUDY_VER} && make install && cd / && \
+    # Clean the source stuff once judy is installed
+    rm -rf /judy-${JUDY_VER} && apk del make alpine-sdk && \
     # fping from alpine apk is on a different location. Moving it.
     mv /usr/sbin/fping /usr/local/bin/fping && \
     chmod 4755 /usr/local/bin/fping && \