ci: install signal in desktop vm and take screenshots

.github/deskrun

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
+export WAYLAND_DISPLAY=wayland-0
+export DISPLAY=:0.0
+
+exec "$@"

.github/workflows/test-snap-can-build.yml

@@ -9,19 +9,65 @@ permissions:
   contents: read
 
 jobs:
-  build:
+  build-and-test:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout repository
+        uses: actions/checkout@v4
 
-      - uses: snapcore/action-build@v1
+      - name: Build snap
+        uses: snapcore/action-build@v1
         id: build
 
-      - uses: diddlesnaps/snapcraft-review-action@v1
+      - name: Review snap
+        uses: diddlesnaps/snapcraft-review-action@v1
         with:
           snap: ${{ steps.build.outputs.snap }}
           isClassic: 'false'
-          # Plugs and Slots declarations to override default denial (requires store assertion to publish)
-          # plugs: ./plug-declaration.json
-          # slots: ./slot-declaration.json
+
+      - name: Enable KVM on runner
+        run: |
+            echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+            sudo udevadm control --reload-rules
+            sudo udevadm trigger --name-match=kvm
+
+      - name: Setup LXD
+        uses: canonical/[email protected]
+
+      - name: Setup test VM
+        run: |
+          # Start a desktop VM
+          lxc launch images:ubuntu/22.04/desktop test-vm --vm \
+            -c limits.cpu=1 -c limits.memory=6GiB -d root,size=12GiB
+
+          # Push the snap we just built into the VM and install it
+          lxc file push "${{ steps.build.outputs.snap }}" test-vm/home/ubuntu/signal.snap
+          lxc exec test-vm -- snap install /home/ubuntu/signal.snap --dangerous
+
+          # Install gnome-screenshot
+          lxc exec test-vm -- apt-get update
+          lxc exec test-vm -- apt-get -y gnome-screenshot
+          
+          # Push the deskrun tool into the VM
+          lxc file push .github/deskrun test-vm/bin/deskrun
+
+      - name: Start Signal Desktop in the VM
+        run: |
+          lxc exec test-vm -- sudo -u ubuntu bash -c "/bin/deskrun snap run signal-desktop &>/home/ubuntu/signal.log &"
+          sleep 10
+      
+      - name: Take screenshots and pull from VM
+        run: |
+          lxc exec test-vm -- sudo -u ubuntu bash -c "/bin/deskrun gnome-screenshot -f /home/ubuntu/screen.png"
+          lxc exec test-vm -- sudo -u ubuntu bash -c "/bin/deskrun gnome-screenshot -w -f /home/ubuntu/window.png"
+          lxc file pull test-vm/home/ubuntu/screen.png screen.png
+          lxc file pull test-vm/home/ubuntu/window.png window.png
+      
+      - name: Upload screenshots as artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: screenshots
+          path: |
+            screen.png
+            window.png