Add rooster release management configuration and instructions (#8567)

I'd rather not be the only one who can easily generate our changelog
entries so I invested some time to get Rooster a bit further along and
add instructions.

pyproject.toml

@@ -69,3 +69,32 @@ force-exclude = '''
   | crates/ruff_python_formatter/resources
 )/
 '''
+
+[tool.rooster]
+major_labels = []  # Ruff never uses the major version number
+minor_labels = ["breaking"]   # Bump the minor version on breaking changes
+
+changelog_ignore_labels = ["internal"]
+
+changelog_sections.breaking = "Breaking changes"
+changelog_sections.preview = "Preview features"
+changelog_sections.rule = "Rule changes"
+changelog_sections.formatter = "Formatter"
+changelog_sections.cli = "CLI"
+changelog_sections.configuration = "Configuration"
+changelog_sections.bug = "Bug fixes"
+changelog_sections.__unknown__ = "Other changes"
+
+# We exclude contributors from the CHANGELOG file
+# Generate separately with `rooster contributors` for the GitHub release page
+changelog_contributors = false
+
+version_files = [
+  "README.md", 
+  "docs/integrations.md",
+  "crates/flake8_to_ruff/Cargo.toml",
+  "crates/ruff_cli/Cargo.toml",
+  "crates/ruff_linter/Cargo.toml",
+  "crates/ruff_shrinking/Cargo.toml",
+  "scripts/benchmarks/pyproject.toml",
+]