Add CI release changelog generator

Creates release changelogs on tag pushes. To structure the changelog the labels on the
PRs are used. Only create release if tag does not contain 'alpha', 'beta' or 'rc'.

.github/config/changelog.json

@@ -0,0 +1,8 @@
+{
+  "sort": "DESC",
+  "pr_template": "- [${{LABELS}}] ${{TITLE}} (#${{NUMBER}})",
+  "template": "${{UNCATEGORIZED}}",
+  "ignore_labels": [
+    "dependencies"
+  ]
+}

.github/workflows/release.yaml

@@ -0,0 +1,32 @@
+name: 'Release'
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  release:
+    if: | 
+      startsWith(github.ref, 'refs/tags/v') &&
+      !contains(github.ref, 'alpha') &&
+      !contains(github.ref, 'beta') &&
+      !contains(github.ref, 'rc')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Create Changelog
+        id: create_changelog
+        uses: mikepenz/release-changelog-builder-action@v2
+        with:
+          configuration: ./.github/config/changelog.json
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create Release
+        uses: actions/create-release@v1
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          body: ${{ steps.create_changelog.outputs.changelog }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}