Add changelog tool config

https://gitea.com/gitea/changelog

.changelog.yml

@@ -0,0 +1,48 @@
+service: gitea
+base-url: https://codeberg.org
+repo: woodpecker-plugins/plugin-docker-buildx
+
+# Changelog groups and which labeled PRs to add to each group
+groups:
+  -
+    name: BREAKING
+    labels:
+      - breaking
+  -
+    name: FEATURES
+    labels:
+      - feature
+  -
+    name: BUGFIXES
+    labels:
+      - bug
+  -
+    name: ENHANCEMENTS
+    labels:
+      - enhancement
+  -
+    name: SECURITY
+    labels:
+      - security
+  -
+    name: TESTING
+    labels:
+      - testing
+  -
+    name: TRANSLATION
+    labels:
+      - translation
+  -
+    name: BUILD
+    labels:
+      - build
+  -
+    name: DOCS
+    labels:
+    - documentation
+  -
+    name: MISC
+    default: true
+
+# regex indicating which labels to skip for the changelog
+skip-labels: skip-changelog|backport*