chore: add a config file for git cliff

This is done so that the generated changelog carries more information
(i.e. the scope of the change).

Co-Authored-by: Levente Polyak <anthraxx@archlinux.org>
Signed-off-by: Christian Heusel <christian@heusel.eu>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

README.md

@@ -23,6 +23,34 @@ will automatically build the project and proxy all calls to the local build dire
 ./test/bin/pkgctl --help
 ```
 
+### Commit messages
+
+All commits must follow [conventional commits](https://www.conventionalcommits.org).
+
+The following groups are allowed:
+
+- chore
+- feat
+- fix
+- doc
+- perf
+- test
+
+To override the scope for the changelog entry use the `Component:` trailer.
+
+Example:
+
+```
+feat(db): yay mega cool feature
+
+Very long and useful description.
+
+Fixes #1
+Fixes #2
+
+Component: pkgctl db remove
+```
+
 ## Releasing
 
 1. bump the version in the Makefile

cliff.toml

@@ -0,0 +1,44 @@
+[changelog]
+header = "# Changelog\n\n"
+body = """
+{%- if version -%}
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{%- else -%}
+    ## [unreleased]
+{%- endif %}
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | upper_first }}
+    {% for commit in commits | sort(attribute="message") %}
+		- {% set component = commit.footers | filter(attribute="token", value="Component") | map(attribute="value") | join %}
+		{%- if component %}{{ component }}: {% elif commit.scope %}{{ commit.scope }}: {% endif %}
+		{{- commit.message | upper_first }}
+		{%- set fixes = commit.footers | filter(attribute="token", value="Fixes") %}
+		{%- for fix in fixes %}{{ fix.separator }}{{ fix.value }}{% endfor %}
+    {%- endfor %}
+{% endfor %}
+
+"""
+footer = ""
+
+# remove the leading and trailing whitespaces from the template
+trim = true
+
+[git]
+# allow only conventional commits
+# https://www.conventionalcommits.org
+conventional_commits = true
+# regex for parsing and grouping commits
+commit_parsers = [
+    { message = "^chore\\(release\\): version", skip = true},
+    { message = "^feat", group = "Features"},
+    { message = "^fix", group = "Bug Fixes"},
+    { message = "^doc", group = "Documentation"},
+    { message = "^perf", group = "Performance"},
+    { message = "^test", group = "Testing"},
+    { message = "^chore", group = "Miscellaneous Tasks"},
+    { body = ".*security", group = "Security"},
+]
+# filter out the commits that are not matched by commit parsers
+filter_commits = false
+# glob pattern for matching git tags
+tag_pattern = "*v[0-9]*"