[ci] Test with vcs

.github/scripts/defaults.sh

@@ -11,13 +11,13 @@ REMOTE_MAKE_NPROC=4
 REMOTE_PREFIX=$CI_DIR/${GITHUB_REPOSITORY#*/}-${GITHUB_REF_NAME//\//-}
 REMOTE_WORK_DIR=$GITHUB_WORKSPACE
 REMOTE_CHIPYARD_DIR=$GITHUB_WORKSPACE
-REMOTE_SIM_DIR=$REMOTE_CHIPYARD_DIR/sims/verilator
+REMOTE_SIM_DIR=$REMOTE_CHIPYARD_DIR/sims/vcs
 REMOTE_FIRESIM_DIR=$REMOTE_CHIPYARD_DIR/sims/firesim/sim
 REMOTE_FPGA_DIR=$REMOTE_CHIPYARD_DIR/fpga
 
 # local variables (aka within the docker container)
 LOCAL_CHIPYARD_DIR=$GITHUB_WORKSPACE
-LOCAL_SIM_DIR=$LOCAL_CHIPYARD_DIR/sims/verilator
+LOCAL_SIM_DIR=$LOCAL_CHIPYARD_DIR/sims/vcs
 LOCAL_FIRESIM_DIR=$LOCAL_CHIPYARD_DIR/sims/firesim/sim
 
 # CI uses temp directories with very long names

.github/workflows/chipyard-gpu-flow.yml

@@ -1,9 +1,9 @@
 name: chipyard-ci-full-flow-gpu
 
-on:
-  push:
-    branches:
-      # - graphics
+# on:
+#   push:
+#     branches:
+#       - graphics
 
 defaults:
   run: