Add support for releasing by GitHub Actions

Author: kou

.github/workflows/release.yaml

@@ -0,0 +1,63 @@
+# Copyright (C) 2025  Sutou Kouhei <kou@clear-code.com>
+#
+# License: GPLv3+, GFDL and/or CC BY-SA 3.0
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+name: Release
+on:
+  push:
+    tags:
+      - "*"
+jobs:
+  github:
+    name: GitHub
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - name: Release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          ruby \
+            -e 'print("## "); puts(ARGF.read.split(/^## /)[1])' \
+            NEWS.md > release-note.md
+          title="$(head -n 1 release-note.md | sed -e 's/^## //')"
+          tail -n +2 release-note.md > release-note-without-version.md
+          gh release create \
+            ${GITHUB_REF_NAME} \
+            --discussion-category Announcements \
+            --notes-file release-note-without-version.md \
+            --title "${title}"
+
+  rubygems:
+    name: RubyGems
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      id-token: write
+    environment: release
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+      - name: Install dependencies
+        run: |
+          gem install rabbit
+      - uses: rubygems/configure-rubygems-credentials@v1.0.0
+      - name: Push gems
+        run: |
+          rake publish:rubygems

NEWS.md

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+# NEWS
+
+## ClearCode theme 1.0.6: 2025-08-15
+
+This is a release for Rabbit 4.0.0.
+
+### Improvements
+
+  * Added an option to disable auto `as-large-as-possible`.
+
+  * Added support for Motoya L Maru font name in Japanese.
+
+  * Stopped setting window icon because it's deprecated in Rabbit
+    4.0.0.