example, in `mkosi.local.conf`, we could have the following settings:
```conf
-[Content]
+[Build]
BuildSources=../mkosi:mkosi
../fedora/mkosi:mkosi/rpm
BuildSourcesEphemeral=yes
[Content]
Packages=abc
+
+ [Build]
Environment=MY_KEY=MY_VALUE
[Output]
(d / "mkosi.conf").write_text(
"""\
- [Content]
+ [Build]
Environment=MY_KEY=MY_VALUE
[Host]
OutputDirectory=abcde
Output=test
- [Content]
+ [Build]
Environment=Distribution=%d
Release=%r
Architecture=%a
(d / "mkosi.conf.d").mkdir()
(d / "mkosi.conf.d/abc.conf").write_text(
"""\
- [Content]
+ [Build]
Environment=ConfigAbcDirectory=%D
ConfigAbcConfdir=%C
ConfigAbcPwd=%P
(d / "mkosi.conf.d/qed").mkdir()
(d / "mkosi.conf.d/qed/mkosi.conf").write_text(
"""
- [Content]
+ [Build]
Environment=ConfigQedDirectory=%D
ConfigQedConfdir=%C
ConfigQedPwd=%P
[Config]
PassEnvironment=PassThisEnv
- [Content]
+ [Build]
Environment=TestValue2=300
TestValue3=400
PassThisEnv=abc