fixup! Bump to Chisel 6, migrate to svsim

.github/workflows/test.yml

@@ -23,7 +23,26 @@ jobs:
           jvm: adopt:11
           apps: sbt mill
       - name: Install Verilator
-        run: sudo apt install verilator
+        run: |
+          # Prerequisites:
+          sudo apt install git help2man perl python3 make autoconf g++ flex bison ccache
+          sudo apt install libgoogle-perftools-dev numactl perl-doc
+          sudo apt install libfl2  # Ubuntu only (ignore if gives error)
+          sudo apt install libfl-dev  # Ubuntu only (ignore if gives error)
+          sudo apt install zlibc zlib1g zlib1g-dev  # Ubuntu only (ignore if gives error)
+
+          git clone https://github.com/verilator/verilator
+
+          # Every time you need to build:
+          unsetenv VERILATOR_ROOT  # For csh; ignore error if on bash
+          unset VERILATOR_ROOT  # For bash
+          cd verilator
+          git checkout v5.012
+
+          autoconf
+          ./configure
+          make
+          sudo make install
       - name: SBT Test
         run: sbt test
       - name: mill Test