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-3.2.md

@@ -0,0 +1,61 @@
+---
+layout: default
+title: Release Notes - Mock v3.2
+---
+
+Released on 2022-10-14.
+
+## Mock v3.2 changes:
+
+- The `cleanup_on_success=False` needs to use `rpmbuild --noclean` to avoid
+  an automatic cleanup of `%{buildroot}` by RPM (we started using `--noclean` in
+  [v3.1](Release-Notes-3.1).  The `--noclean` option is though not available on
+  old systems (EL6 and older).  The new Mock *v3.2* fixes this, and stops using
+  `--noclean` for old target builds.  Related [rhbz#2105393][].
+
+- The `mock --list-chroots` now performs much faster; the amount of `fork()`
+  calls while listing the chroot configuration files was minimized.
+
+- Files installed into `/var/lib/mock` and `/var/cache/mock` no longer get the
+  SGID bit (which enforces `mock` group ownership).  The bit shouldn't be needed
+  (by common sense, but also given our testsuite is green), so we dropped the
+  bit.  Should you newly have any inconvenience, please report.
+
+- The `simple_load_config()` library method (used e.g. by Fedora Review) was
+  simplified so it doesn't attempt to elevate the `mock` group process
+  ownership.  Processing Mock's configuration is equal to evaluating a Python
+  code, so for security reasons we artificially fail the `simple_load_config()`
+  call if executed by root, [rhbz#2080735][].
+
+- Error() (Exception) code was rewritten a bit, so the raised exceptions are
+  easily (de-)serializable by the Python pickle library.  We can then e.g.
+  naturally handle the exceptions raised by Mock's `fork()` sub-processes
+  (exceptions from child processes are pickle-deserialized).  This change could
+  potentially affect the `mockbuild:get_class_by_code()` users, if any.
+
+- Mock now better detects the Docker environment run on top of
+  Control Group V2, [PR#986][].
+
+- The `--use-bootstrap-image` now works even if `podman` produces an unexpected
+  `stderr` output, [PR#954][].
+
+- The `mock-scm` package newly runtime-depends on the `rpkg-util` package.  This
+  package is used for building source RPMs from DistGit, fixes [rhbz#2128212][].
+
+- Mock starts using the SPDX format of License field in the spec file.
+
+
+**Following contributors contributed to this release:**
+
+ * Achal Velani
+ * Michael Ho
+ * Miroslav Suchý
+
+Thank you.
+
+
+[rhbz#2105393]: https://bugzilla.redhat.com/2105393
+[PR#954]: https://github.com/rpm-software-management/mock/pull/954
+[rhbz#2128212]: https://bugzilla.redhat.com/2128212
+[rhbz#2080735]: https://bugzilla.redhat.com/2080735
+[PR#986]: https://github.com/rpm-software-management/mock/pull/986