moved copy into correct image

docker/Dockerfile

@@ -3,16 +3,15 @@ ARG ubuntu_version=22.04
 
 FROM ghcr.io/cyclus/cycamore_${ubuntu_version}_${pkg_mgr}/cycamore as cycamore
 
-COPY . /cymetric
-WORKDIR /cymetric
-
 FROM cycamore as apt-deps
 RUN apt update --fix-missing && apt install -y python3-pip python3-pytest
 
 FROM cycamore as conda-deps
 RUN mamba install -y pip pytest
 
 FROM ${pkg_mgr}-deps as cymetric
+COPY . /cymetric
+WORKDIR /cymetric
 RUN python -m pip install --target $(python -m site --user-site) .
 
 FROM cymetric as cymetric-pytest