mkosi: Do not run unit tests during build by default (#36450)

.github/workflows/mkosi.yml

@@ -161,6 +161,7 @@ jobs:
           UseSubvolumes=yes
           ToolsTreeDistribution=${{ matrix.distro }}
           ToolsTreeRelease=${{ matrix.release }}
+          WithTests=yes
 
           WorkspaceDirectory=$TMPDIR
           PackageCacheDirectory=$TMPDIR/cache

docs/HACKING.md

@@ -36,12 +36,13 @@ or via your distribution's package manager. Note that systemd regularly adopts
 newer mkosi features that are not in an official release yet so there's a good
 chance that your distribution's packaged version of mkosi will be too old.
 
-Then, you can build and run systemd executables as follows:
+Then, you can build, run and test systemd executables as follows:
 
 ```sh
 $ mkosi -f sandbox -- meson setup build
 $ mkosi -f sandbox -- meson compile -C build
 $ mkosi -f sandbox -- build/systemctl --version
+$ mkosi -f sandbox -- meson test -C build          # Run the unit tests
 ```
 
 To build and boot an OS image with the latest systemd installed:

mkosi.conf

@@ -34,6 +34,7 @@ ToolsTree=default
 BuildDirectory=build/mkosi.builddir
 CacheDirectory=build/mkosi.cache
 Incremental=yes
+WithTests=no
 
 [Validation]
 SignExpectedPcr=yes

test/fmf/integration-tests/test.sh

@@ -95,6 +95,7 @@ SandboxTrees=
         /etc/yum.repos.d/:/etc/yum.repos.d/
         /var/share/test-artifacts/:/var/share/test-artifacts/
 Environment=NO_BUILD=1
+WithTests=yes
 EOF
 
     cat /etc/dnf/dnf.conf