github: Add a basic github CI test

This builds libguestfs and runs the in-tree tests, ie. the basic
'./configure && make && make check'.

We're using the "free for public repositories" plan.  The only free
runner available is Ubuntu-based (noble).

The tests are run on pushes to the master branch, and on pull
requests to the master branch.

GObject is not built, since the tests fail and anyway there are some
deep problems with the GObject bindings and they probably will be
removed.

Author: rwmjones

.github/workflows/main.yml

@@ -0,0 +1,78 @@
+# Run the job below on every push to master branch.
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+# Runs basic configure, make and make check.
+jobs:
+  tests:
+    name: Build and run the tests
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Enable source repositories
+        run: |
+          sudo sed -i 's/Types: deb$/Types: deb deb-src/g' \
+                   /etc/apt/sources.list.d/ubuntu.sources
+
+      - name: Install build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get -y build-dep libguestfs
+
+      - name: Install extra dependencies
+        run: |
+          # Git is needed to run git submodule command.
+          # json-c is missing from the Ubuntu package deps.
+          sudo apt-get -y install git libjson-c-dev
+
+      - name: Fix broken Ubuntu kernel permissions
+        run: |
+          # https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725
+          sudo chmod 0644 /boot/vmlinuz*
+
+      - name: Enable KVM
+        run: |
+          sudo chmod 0666 /dev/kvm
+
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Checkout submodule
+        run: |
+          git submodule update --init
+
+      - name: Compile the code
+        run: |
+          autoreconf -fiv
+          ./configure --disable-gobject
+          make -j
+
+      - name: Run the quick test
+        run: |
+          make quickcheck
+
+      - name: Run the full tests
+        run: |
+          # grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh
+          # doesn't exist. Please specify --target or --directory
+          export SKIP_TEST_GRUB_INSTALL_0=1
+          # Errors from hexdump, maybe not installed?
+          export SKIP_TEST_HEXDUMP_0=1
+          export SKIP_TEST_HEXDUMP_1=1
+          export SKIP_TEST_HEXDUMP_2=1
+          # error: luks_close: cryptsetup exited with status 5:
+          # Device lukstest is still in use
+          export SKIP_TEST_LUKS_SH=1
+          # error: passt exited with status 1
+          export SKIP_TEST_NETWORK_SH=1
+          # error: passt exited with status 1
+          export SKIP_TEST_RSYNC_SH=1
+          if ! make check; then
+              find -name test-suite.log -exec cat {} \;
+              exit 1
+          fi