try to use singularity for verilator

.github/.gitignore

@@ -0,0 +1 @@
+*.simg

.github/verilator_singularity

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+IMAGE='verilator/verilator:v5.018'
+FILE=$(dirname $0)/verilator.simg
+
+if [ ! -f $FILE ]; then
+    singularity pull $FILE docker://$IMAGE
+fi
+
+export LC_ALL="C"
+singularity run $FILE $@

.github/workflows/ci.yml

@@ -7,11 +7,15 @@ jobs:
     name: Generation
     runs-on: ubuntu-22.04
     steps:
+      - uses: eWaterCycle/setup-singularity@v7
+        with:
+          singularity-version: 3.8.7
+
       - name: Checkout sources
         uses: actions/checkout@v4
 
       - name: Install Tools
-        run: sudo apt-get install ghdl verilator
+        run: sudo apt-get install ghdl
 
       - name: Setup Python venv
         run: |
@@ -22,6 +26,7 @@ jobs:
 
       - name: Test Generation
         run: |
+          export VERILATOR=$(pwd)/.github/verilator_singularity
           cd proto
           python3 tests.py
 

proto/tests.py

@@ -413,8 +413,13 @@ def test_hdl_ref():
         if res.returncode != 0:
             error('VHDL elaboration failed for {}'.format(f))
 
+
+        if 'VERILATOR' in os.environ:
+            verilator_cmd = os.environ['VERILATOR']
+        else:
+            verilator_cmd = 'verilator'
         sv_pkgs = [srcdir + 'tb/dpssram.sv', srcdir + 'tb/wishbone_pkg.sv']
-        res = subprocess.run(['verilator', '--lint-only', '--top-module', top_entity] + sv_pkgs + [sv_file])
+        res = subprocess.run([verilator_cmd, '--lint-only', '--top-module', top_entity] + sv_pkgs + [sv_file])
         if res.returncode != 0:
             error('SV elaboration failed for {}'.format(f))