ci: add dependencies required for Verilator-based tests

.github/workflows/ci.yml

@@ -16,6 +16,7 @@ jobs:
           sudo apt-get install wget build-essential python3
           pip3 install setuptools
           pip3 install requests
+          pip3 install pexpect
 
       # Install (n)Migen / LiteX / Cores
       - name: Install LiteX
@@ -31,6 +32,11 @@ jobs:
           sudo mkdir /usr/local/riscv
           sudo cp -r $PWD/../riscv64-*/* /usr/local/riscv
 
+      # Install Verilator with dependencies
+      - name: Install Verilator
+        run: |
+          sudo apt-get install verilator libevent-dev libjson-c-dev
+
       # Install Project
       - name: Install Project
         run: python3 setup.py develop --user