Add GitHub actions workflow

.github/workflows/main.yml

@@ -0,0 +1,24 @@
+name: Build image
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup
+        run: |
+          wget https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key
+          add - && sudo sh -c "echo deb https://download.virtualbox.org/virtualbox/debian
+          bionic contrib >> /etc/apt/sources.list" && sudo apt-get update && sudo apt-get
+          install build-essential gcc make linux-headers-$(uname -r) virtualbox-6.0 && sudo
+          usermod -aG vboxusers $(whoami)
+          mkdir output-virtualbox-iso && pushd output-virtualbox-iso && wget --progress=dot:giga https://github.com/sfalexrog/clever_vm/releases/download/v0.1_base_vm/clover-devel.ova && popd
+          sudo apt install -y xvfb
+      - name: Build
+        run: xvfb-run ./build.sh