add a github workflow

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

.github/workflows/kernel.config

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+# Add custom kernel configs here

.github/workflows/run-kernel

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+#!/bin/bash
+#
+# Run a test for TIMEOUT seconds inside virtme-ng and catch potential errors.
+
+# Maximum time the test run.
+TEST_TIMEOUT=30
+
+# Maximum timeout for the guest run (this is used to hard-shutdown the guest in
+# case of system hangs).
+GUEST_TIMEOUT=60
+
+# Test command to run
+TEST_CMD="uname -r"
+
+# Check if virtme-ng is available.
+if [ ! -x `which vng` ]; then
+    echo "vng not found, please install virtme-ng to enable testing"
+    exit 1
+fi
+
+# NOTE: virtme-ng automatically runs the kernel from the current working
+# directory by default.
+#
+rm -f /tmp/output
+(timeout --foreground --preserve-status ${GUEST_TIMEOUT} \
+    vng --force-9p --disable-microvm --verbose -- \
+        "timeout --foreground --preserve-status ${TEST_TIMEOUT} ${TEST_CMD}" \
+            2>&1 </dev/null || true) | tee /tmp/output
+sed -n -e '/\bBUG:/q1' \
+       -e '/\bWARNING:/q1' /tmp/output
+res=$?
+if [ ${res} -ne 0 ]; then
+    echo "FAIL"
+    exit 1
+else
+    echo "OK"
+fi

.github/workflows/test-kernel.yml

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+name: test-kernel
+run-name: ${{ github.actor }} PR run
+on: [pull_request, push]
+jobs:
+  test-kernel:
+    runs-on: ubuntu-22.04
+    steps:
+      ### OTHER REPOS ####
+
+      # Hard turn-off interactive mode
+      - run: echo 'debconf debconf/frontend select Noninteractive' | sudo debconf-set-selections
+
+      # Refresh packages list
+      - run: sudo apt update
+
+      ### DOWNLOAD AND INSTALL DEPENDENCIES ###
+
+      # Download dependencies packaged by Ubuntu
+      - run: sudo apt -y install gcc make git coreutils cmake elfutils libelf-dev libunwind-dev libzstd-dev linux-headers-generic linux-tools-common linux-tools-generic ninja-build python3-pip python3-requests qemu-kvm udev iproute2 busybox-static libvirt-clients kbd kmod file rsync zstd pahole flex bison cpio libcap-dev libelf-dev python3-dev cargo rustc
+
+      # Checkout repository
+      - uses: actions/checkout@v4
+
+      # Install virtme-ng
+      - run: pip install virtme-ng
+
+      ### END DEPENDENCIES ###
+
+      # Build a minimal kernel using virtme-ng
+      - run: vng -v --build --config .github/workflows/kernel.config
+
+      # Boot test the kernel
+      - run: .github/workflows/run-kernel