Fix 5

Move CACHE_BUST before COPY spack.yaml command

containers/jug/dev.Dockerfile

@@ -73,6 +73,11 @@ RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
  && spack mirror add docker /var/cache/spack-mirror                     \
  && spack mirror list
 
+## This variable will change whenevery either spack.yaml or our spack package
+## overrides change, triggering a rebuild
+ARG CACHE_BUST="hash"
+ARG CACHE_NUKE=""
+
 ## Setup our custom environment and package overrides
 COPY spack $SPACK_ROOT/eic-spack
 RUN spack repo add --scope site "$SPACK_ROOT/eic-spack"                 \
@@ -83,10 +88,6 @@ RUN spack repo add --scope site "$SPACK_ROOT/eic-spack"                 \
  && spack env activate .                                                \
  && spack concretize
 
-## This variable will change whenevery either spack.yaml or our spack package
-## overrides change, triggering a rebuild
-ARG CACHE_BUST="hash"
-ARG CACHE_NUKE=""
 
 ## Now execute the main build (or fetch from cache if possible)
 ## note, no-check-signature is needed to allow the quicker signature-less