Make .conda directory, in case it does not exist

When there is no config for conda, there will be no .conda directory.
Then the copy command would fail. To avoid this, we make a directory in
any case.

keras3-cpu/Dockerfile

@@ -165,6 +165,7 @@ RUN chown -R ${NB_USER} "/home/${NB_USER}/.jupyter" && \
     mkdir -p /etc/skel/.cache && \
     cp -r "/home/${NB_USER}/.cache/matplotlib" /etc/skel/.cache/ && \
     # stuff
+    mkdir -p "/home/${NB_USER}/.conda" && \
     cp -r "/home/${NB_USER}/.conda" "/home/${NB_USER}/.config" "/home/${NB_USER}/.jupyter" /etc/skel/ && \
     # VS Code extension "gitlab-workflow", default gitlab server: gitlab.cvh-server.de
     printf '%s\n' \

keras3-gpu/Dockerfile

@@ -126,6 +126,7 @@ RUN chown -R ${NB_USER} "/home/${NB_USER}/.jupyter" && \
     mkdir -p /etc/skel/.cache && \
     cp -r "/home/${NB_USER}/.cache/matplotlib" /etc/skel/.cache/ && \
     # stuff
+    mkdir -p "/home/${NB_USER}/.conda" && \
     cp -r "/home/${NB_USER}/.conda" "/home/${NB_USER}/.config" "/home/${NB_USER}/.jupyter" /etc/skel/ && \
     # VS Code extension "gitlab-workflow", default gitlab server: gitlab.cvh-server.de
     printf '%s\n' \

pytorch-gpu/Dockerfile

@@ -126,6 +126,7 @@ RUN chown -R ${NB_USER} "/home/${NB_USER}/.jupyter" && \
     mkdir -p /etc/skel/.cache && \
     cp -r "/home/${NB_USER}/.cache/matplotlib" /etc/skel/.cache/ && \
     # stuff
+    mkdir -p "/home/${NB_USER}/.conda" && \
     cp -r "/home/${NB_USER}/.conda" "/home/${NB_USER}/.config" "/home/${NB_USER}/.jupyter" /etc/skel/ && \
     # VS Code extension "gitlab-workflow", default gitlab server: gitlab.cvh-server.de
     printf '%s\n' \