Use lockfiles for conda

.github/scripts/install-conda.sh

@@ -159,6 +159,10 @@ else
     # conda-libmamba-solver is a special case and must always be installed into the base environment
     # see https://www.anaconda.com/blog/a-faster-conda-for-a-growing-community
     $SUDO "$CONDA_EXE" install $DRY_RUN_OPTION -y -n base conda-libmamba-solver
+
+    # conda-lock is a special case and must always be installed into the base environment
+    $SUDO "$CONDA_EXE" install $DRY_RUN_OPTION -y -n base conda-lock
+
     # Use the fast solver by default
     "${DRY_RUN_ECHO[@]}" $SUDO "$CONDA_EXE" config --system --set experimental_solver libmamba