source conda.sh from conda base environment rather than the chipyard conda env (which does not have conda in lean lockfile)

scripts/build-setup.sh

@@ -181,6 +181,7 @@ if run_step "1"; then
 
     # use conda-lock to create env
     conda-lock install --conda $(which conda) -p $CYDIR/.conda-env $LOCKFILE &&
+    source $(conda info --base)/etc/profile.d/conda.sh &&
     conda activate $CYDIR/.conda-env
     exit_if_last_command_failed