Add release draft workflow (#92)

.github/release-drafter.yml

@@ -0,0 +1,30 @@
+name-template: 'v$RESOLVED_VERSION'
+tag-template: 'v$RESOLVED_VERSION'
+template: |
+  $CHANGES
+category-template: '#### $TITLE'
+change-template: '* #$NUMBER - $TITLE (@$AUTHOR)'
+categories:
+  - title: 'Breaking changes'
+    label: 'breaking'
+  - title: 'Enhancements'
+    label: 'enhancement'
+  - title: 'Bug fixes'
+    label: 'bug'
+  - title: 'Maintenance'
+    label: 'chore'
+
+version-resolver:
+  major:
+    labels:
+      - 'breaking'
+  minor:
+    labels:
+      - 'enhancement'
+  patch:
+    labels:
+      - 'bug'
+      - 'chore'
+
+exclude-labels:
+  - 'skip-changelog'

.github/workflows/main.yml → .github/workflows/build.yml

@@ -1,5 +1,9 @@
 name: build
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/release.yml

@@ -0,0 +1,12 @@
+name: release-draft
+on:
+  push:
+    branches:
+      - master
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}