fix(ci): pin + cache

.github/workflows/test.yml

@@ -45,6 +45,9 @@ jobs:
           echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list
           sudo apt update && sudo apt install -y vagrant
           vagrant version
+          vagrant plugin list
+          sudo /sbin/rcvboxdrv setup
+          sudo modprobe vboxdrv
           echo "::endgroup::"
 
       - name: Configure VirtualBox