ci: add release workflow

Author: KieranKaelin

.github/workflows/release.yaml

@@ -0,0 +1,40 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  RELEASE_TAR: ./dist/hugo-geekdoc.tar.gz
+
+jobs:
+  release:
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build assets
+        run: npm run build
+
+      - name: Pack
+        run: npm run pack
+
+      - name: Extract release to directory
+        run: |
+          tar -xf ./dist/hugo-geekdoc.tar.gz --directory ./dist/release
+
+      - name: Push to dist branch
+        uses: s0/git-publish-subdir-action@develop
+        env:
+          REPO: self
+          BRANCH: dist
+          FOLDER: dist/release
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}