enhance: Add comprehensive .gitignore for deb-mock project

- Add mock-specific build artifacts (chroot/, mock-*, mockroot/)
- Include package build files (*.deb, *.changes, *.buildinfo)
- Add development tools (.coverage, .pytest_cache, .tox)
- Include system files (.DS_Store, Thumbs.db, ._*)
- Add temporary and backup files (*.tmp, *.bak, *.backup)
- Include local configuration overrides (config.local.yaml, .env.local)
- Add test artifacts and documentation builds
- Comprehensive coverage for Python build system project

This ensures build artifacts, chroot environments, and development
tools are properly ignored in version control.

docs/Release-Notes-5.2.md

@@ -0,0 +1,30 @@
+---
+layout: default
+title: Release Notes - Mock 5.2
+---
+
+Released on 2023-09-27.
+
+### Mock 5.2 new features
+
+- Mock newly logs out its command-line arguments to better deduct what was
+  happening at build time.
+
+
+### Bugfixes
+
+- The fixes introduced in Mock 5.1 included a compatibility issue with Python in
+  Enterprise Linux 8 due to a dependency on the `capture_output=True` feature in
+  the `subprocess` module, which was added in Python 3.7.  However, EL 8 is
+  running on Python 3.6.  This compatibility issue has been resolved in Mock by
+  using `stdout=subprocess.PIPE` instead.  This update was made based on a [report
+  from Bodhi update](https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-45ace77fca). 
+- Previous versions of Mock mistakenly expanded every `~` occurrence
+  (tilde character) in the specified source path with `--copyout`.  So
+  files `~/foo~bar.txt` were searched on path `/builddir/foo/builddirbar.txt`
+  instead of just `/builddir/foo~bar.txt`.  Fixes [rhbz#2239035][]. 
+- The Mock state monitoring (creating state.log) was fixed so that Mock, unless
+  some exception is raised, always checks that we finished all the states we
+  started.
+
+[rhbz#2239035]: https://bugzilla.redhat.com/2239035