Add release-drafter configuration files (#36)

Author: taruma

.github/release-drafter.yml

@@ -0,0 +1,46 @@
+name-template: '$RESOLVED_VERSION'
+tag-template: '$RESOLVED_VERSION'
+categories:
+  - title: '🚀 New Features'
+    labels:
+      - 'feature'
+  - title: '✨ Enhancements'
+    labels:
+      - 'enhancement'
+  - title: '🐛 Bug Fixes'
+    labels:
+      - 'bug'
+  - title: '📃 Documentation'
+    labels:
+      - 'docs'
+      - 'documentation'
+  - title: '🖥️ Website'
+    labels:
+      - 'site'
+  - title: '📎 Github'
+    labels:
+      - 'github'
+exclude-labels:
+  - 'ask'
+
+change-template: '- (#$NUMBER) | $TITLE @$AUTHOR'
+change-title-escapes: '\<*_&'
+
+version-resolver:
+  major:
+    labels:
+      - 'major'
+  minor:
+    labels:
+      - 'minor'
+  patch:
+    labels:
+      - 'patch'
+  default: patch
+
+template: |
+  ## Changes
+  $CHANGES
+
+  ## Contributors
+  $CONTRIBUTORS

.github/workflows/release-drafter.yml

@@ -0,0 +1,32 @@
+name: Release Drafter
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - main
+  # pull_request event is required only for autolabeler
+  pull_request:
+    # Only following types are handled by the action, but one can default to all as well
+    types: [opened, reopened, synchronize]
+  # pull_request_target event is required for autolabeler to support PRs from forks
+  # pull_request_target:
+  #   types: [opened, reopened, synchronize]
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      # (Optional) GitHub Enterprise requires GHE_HOST variable set
+      #- name: Set GHE_HOST
+      #  run: |
+      #    echo "GHE_HOST=${GITHUB_SERVER_URL##https:\/\/}" >> $GITHUB_ENV
+
+      # Drafts your next Release notes as Pull Requests are merged into "master"
+      - uses: release-drafter/release-drafter@v6
+        # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
+        # with:
+        #   config-name: my-config.yml
+        #   disable-autolabeler: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}