no caching in test containers

test/Dockerfile

@@ -32,7 +32,11 @@ RUN pacman -Syu --noconfirm \
         sudo \
     && pacman -Scc --noconfirm
 
-RUN useradd -m -u "$UID_ARG" -s /bin/bash -G wheel "$USERNAME"
+# Remove the /etc/skel profile files so `useradd -m` starts the test user with
+# a truly empty HOME: the term package owns .bashrc/.bash_profile, and stow
+# must be able to take ownership of them without conflicting with copied files.
+RUN rm -f /etc/skel/.bashrc /etc/skel/.bash_profile /etc/skel/.bash_logout \
+    && useradd -m -u "$UID_ARG" -s /bin/bash -G wheel "$USERNAME"
 
 # Passwordless sudo so scripts that call `sudo pacman`, `sudo systemctl`, etc.
 # do not hang on a password prompt inside the container.