Add Release Drafter

We are now using the Release Drafter to generate the changelog for new
releases. For that reason we are also removing the CHANGELOG.md file, so
that users do not have to add manuall entries to the changelog.

The changelog is generated based on the following labels: "changelog:
added", "changelog: fixed" and "changelog: changed". One of these labels
must be added to a PR.

Author: ricoberger

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,7 @@
 <!--
   Keep PR title verbose enough and add prefix telling about what plugin it touches e.g "[prometheus]" or "[app]"
+
+  If you add a breaking change within your PR you should add ":warning:" to the title, e.g. ":warning: [app] My breaking change"
 -->
 
 <!--
@@ -13,6 +15,5 @@
     - [#<PR-ID>](<PR-URL>): [<PLUGIN>] ...
 -->
 
-- [ ] I added a [CHANGELOG](https://github.com/kobsio/kobs/blob/master/CHANGELOG.md) entry for this change.
 - [ ] I adjusted the corresponding [documentation](https://github.com/kobsio/kobs/tree/main/docs) for this change.
 - [ ] I adjusted the [values.yaml](https://github.com/kobsio/kobs/blob/main/deploy/helm/kobs/values.yaml) file and the [documentation for all values](https://github.com/kobsio/kobs/blob/main/docs/installation/helm.md).

.github/release.yaml

@@ -0,0 +1,29 @@
+name-template: "$RESOLVED_VERSION"
+tag-template: "$RESOLVED_VERSION"
+version-template: "v$MAJOR.$MINOR.$PATCH"
+categories:
+  - title: "Added"
+    labels:
+      - "changelog: added"
+  - title: "Fixed"
+    labels:
+      - "changelog: fixed"
+  - title: "Changed"
+    labels:
+      - "changelog: changed"
+version-resolver:
+  minor:
+    labels:
+      - "changelog: added"
+      - "changelog: changed"
+  patch:
+    labels:
+      - "changelog: fixed"
+  default: patch
+category-template: "### $TITLE"
+change-template: '- #$NUMBER: $TITLE @$AUTHOR'
+template: |
+  $CHANGES
+replacers:
+  - search: ':warning:'
+    replace: ':warning: _Breaking change:_ :warning:'

.github/workflows/release.yaml

@@ -0,0 +1,25 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  changelog:
+    permissions:
+      contents: write
+      pull-requests: write
+    name: Changelog
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update Changelog
+        uses: release-drafter/release-drafter@v5
+        with:
+          config-name: release.yaml
+          disable-autolabeler: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}