Add separate copy of tests to Dockerfile for ARC

Author: calvinp0

Dockerfile

@@ -84,6 +84,9 @@ COPY --from=builder --chown=mambauser:mambauser /opt/conda /opt/conda
 COPY --from=builder --chown=mambauser:mambauser /home/mambauser/.juliaup /home/mambauser/.juliaup
 COPY --from=builder --chown=mambauser:mambauser /home/mambauser/Code /home/mambauser/Code
 
+# Need to copy the tests separately as they are not in the ARC git by default
+COPY --chown=mambauser:mambauser dockerfiles/docker_tests /home/mambauser/Code/ARC/docker_tests
+
 # --- Entry wrapper ----------------------------------------------------------
 COPY --chmod=755  dockerfiles/entrywrapper.sh  /usr/local/bin/entrywrapper.sh
 COPY --chmod=644  dockerfiles/aliases.sh       /etc/profile.d/aliases.sh