Test all drivers an connections

Rename the `vfkit` workflow to `integration` and test vfkit with fd and
socket, and qemu with fd.

Since we install qemu converting image format, we have everything we
need to run the vm with qemu.

Add tree commands for inspecting qemu installation and ~/.vmnet-helper
directory.

.github/workflows/vfkit.yaml → .github/workflows/integration.yaml

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 ---
-name: vfkit
+name: Integration
 
 on:
   pull_request:
@@ -12,18 +12,32 @@ on:
 
 jobs:
   example:
-    name: Example (vfkit)
+    name: Example
     # macos-15 (arm64) does not support nested virtualization yet.
     runs-on: macos-13
+    strategy:
+      fail-fast: false
+      matrix:
+        driver: [vfkit, qemu]
+        connection: [fd, socket]
+        exclude:
+          - driver: qemu
+            connection: socket
     steps:
       - name: Host info
         run: |
           uname -a
           sw_vers
           ifconfig
       - name: Install requirements
-        run: brew install meson qemu cdrtools coreutils
+        run: brew install meson qemu cdrtools coreutils tree
+      - name: Inspect qemu
+        # Looking up both prefixes to make it eaier to port to arm64 in the future.
+        run: |
+          tree -h /usr/local/share/qemu || true
+          tree -h /opt/homebrew/share/qemu || true
       - name: Install vfkit
+        if: matrix.driver == 'vfkit'
         run: |
           curl -LO https://github.com/crc-org/vfkit/releases/download/v0.6.0/vfkit
           sudo install vfkit /usr/local/bin/
@@ -53,15 +67,16 @@ jobs:
       - name: Start example VM
         run: |
           source .venv/bin/activate
-          ./example test -v &
+          ./example test --driver ${{ matrix.driver }} --connection ${{ matrix.connection }} -v &
           vm="$HOME/.vmnet-helper/vms/test"
           if ! timeout 5m bash -c "until test -f "$vm/ip-address"; do sleep 3; done"; then
               echo >&2 "Timeout waiting for $vm/ip-address"
               exit 1
           fi
-      - name: Logs
+      - name: Inspect example VM
         if: always()
         run: |
+          tree -h ~/.vmnet-helper
           head -n 500 ~/.vmnet-helper/vms/test/*.log /var/db/dhcpd_leases || true
       - name: Prepare example VM
         run: |