github: Add basic github CI tests

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.  We run the tests
directly on an Ubuntu VM, versions 24.04 & latest.  Also on Fedora 42,
43 in a container (running on the Ubuntu VM).

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.

Thanks: Stephen Gallagher, Cole Robinson

.github/workflows/main.yml

@@ -0,0 +1,162 @@
+# Run the jobs below on every push to master branch and pull request.
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+# Runs basic configure, make and make check.
+jobs:
+  ubuntu:
+    name: Ubuntu
+    runs-on: ubuntu-${{ matrix.release }}
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        release:
+          - 24.04
+          - latest
+
+    steps:
+      - name: Identify the system
+        run: |
+          cat /etc/os-release
+
+      - name: Enable source repositories
+        run: |
+          sudo sed -i 's/Types: deb$/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@v5
+
+      - 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
+
+  fedora:
+    name: Fedora
+    runs-on: ubuntu-latest  # VM where the container runs
+    strategy:
+      fail-fast: false
+      matrix:
+        release:
+         - 42
+         - 43
+
+    container:
+      image: quay.io/fedora/fedora:${{ matrix.release }}
+      options: --security-opt seccomp=unconfined
+
+    steps:
+      - name: Identify the system
+        run: |
+          cat /etc/os-release
+
+      - name: Install build dependencies
+        run: |
+          dnf builddep -y libguestfs
+
+      - name: Install extra dependencies
+        run: |
+          # Git is needed to run git submodule command.
+          # The others are needed to run the tests.
+          dnf install -y git kernel sqlite perl-hivex rubygem-minitest
+
+      - name: Checkout sources
+        uses: actions/checkout@v5
+
+      - name: Create user
+        run: |
+          useradd -m -s /bin/bash -G wheel guestfs
+          tail /etc/passwd
+
+      - name: Make checkout directory editable by the sscg user
+        run: |
+          chown -R guestfs:wheel ${GITHUB_WORKSPACE}
+
+      - name: Checkout submodule
+        run: |
+          su -c 'git submodule update --init' guestfs
+
+      - name: Compile the code
+        run: |
+          su -c '
+            autoreconf -fiv &&
+            ./configure CFLAGS="-fPIC -g -O2" --disable-gobject &&
+            make -j
+          ' guestfs
+
+      - name: Run the quick test
+        run: |
+          su -c 'make quickcheck' guestfs
+
+      - name: Run the full tests
+        run: |
+          # error: passt exited with status 1
+          export SKIP_TEST_NETWORK_SH=1
+          # error: passt exited with status 1
+          export SKIP_TEST_RSYNC_SH=1
+          # error: internal_autosync: umount: /sysroot: umount: /sysroot:
+          # target is busy
+          export SKIP_RHBZ1011907_1165785_SH=1
+          # We have to set $HOME since su -p won't set it below.
+          export HOME=/home/guestfs
+          if ! su -p -c 'make check' guestfs; then
+              find -name test-suite.log -exec cat {} \;
+              exit 1
+          fi