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diff --git a/.github/workflows/mkosi.yml b/.github/workflows/mkosi.yml
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+---
+# vi: ts=2 sw=2 et:
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# Simple boot tests that build and boot the mkosi images generated by the mkosi config files in mkosi.default.d/.
+name: mkosi
+
+on:
+  push:
+    branches:
+      - main
+      - v[0-9]+-stable
+  pull_request:
+    branches:
+      - main
+      - v[0-9]+-stable
+
+permissions:
+  contents: read
+
+env:
+  # Enable debug logging in systemd, but keep udev's log level to info,
+  # since it's _very_ verbose in the QEMU task
+  # Disable the ISC DHCP servers, as they are failing in Ubuntu
+  KERNEL_CMDLINE: "systemd.unit=mkosi-check-and-shutdown.service !quiet systemd.log_level=debug systemd.log_target=console udev.log_level=info systemd.default_standard_output=journal+console systemd.mask=isc-dhcp-server6.service systemd.mask=isc-dhcp-server.service"
+
+jobs:
+  ci:
+    runs-on: ubuntu-22.04
+    concurrency:
+      group: ${{ github.workflow }}-${{ matrix.distro }}-${{ matrix.release }}-${{ github.ref }}
+      cancel-in-progress: true
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - distro: arch
+            release: rolling
+          - distro: debian
+            release: testing
+          - distro: ubuntu
+            release: jammy
+          - distro: opensuse
+            release: tumbleweed
+          - distro: centos_epel
+            release: 9-stream
+
+    steps:
+    - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
+    - uses: systemd/mkosi@792cbc60eb2dc4a58d66bb3c212bf92f8d50f6ea
+
+    # FIXME: temporary workaround for a file conflict between systemd (C9S) and
+    # systemd-boot (EPEL9). Drop this once systemd in C9S is updated to v252
+    # (should be done by the end of 2022).
+    - name: Fix C9S/EPEL9
+      if: ${{ matrix.release == '9-stream' }}
+      run: sudo sed -i '/add_packages/s/systemd-boot/systemd/g' /usr/local/lib/python3.10/dist-packages/mkosi/__init__.py
+
+    - name: Install
+      run: sudo apt-get update && sudo apt-get install --no-install-recommends python3-pexpect python3-jinja2
+
+    - name: Configure
+      run: |
+        tee mkosi.default <<- EOF
+        [Distribution]
+        Distribution=${{ matrix.distro }}
+        Release=${{ matrix.release }}
+
+        [Content]
+        Environment=CI_BUILD=1
+
+        [Output]
+        KernelCommandLine=${{ env.KERNEL_CMDLINE }}
+
+        [Host]
+        # Sometimes we run on a host with /dev/kvm, but it is broken, so explicitly disable it
+        QemuKvm=no
+        EOF
+
+    - name: Build ${{ matrix.distro }}
+      run: sudo python3 -m mkosi build
+
+    - name: Show ${{ matrix.distro }} image summary
+      run: sudo python3 -m mkosi summary
+
+    - name: Boot ${{ matrix.distro }} systemd-nspawn
+      run: sudo python3 -m mkosi boot ${{ env.KERNEL_CMDLINE }}
+
+    - name: Check ${{ matrix.distro }} systemd-nspawn
+      run: sudo python3 -m mkosi shell bash -c "[[ -e /testok ]] || { cat /failed-services; exit 1; }"
+
+    - name: Boot ${{ matrix.distro }} QEMU
+      run: sudo timeout -k 30 10m python3 -m mkosi qemu
+
+    - name: Check ${{ matrix.distro }} QEMU
+      run: sudo python3 -m mkosi shell bash -c "[[ -e /testok ]] || { cat /failed-services; exit 1; }"