feat: add GitHub Actions workflows for deployment and theme updates

.github/workflows/deploy.yaml

@@ -0,0 +1,53 @@
+name: Deploy to Github Pages
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the
+      # added or changed files to the repository.
+      contents: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Cache Hugo resources
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-hugo-resources
+        with:
+          path: resources
+          key: ${{ env.cache-name }}
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "^1.24.2"
+        run: go version
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v3
+        with:
+          hugo-version: "latest"
+          extended: true
+
+      - name: Build
+        run: hugo --minify --gc
+
+      - name: Deploy 🚀
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          branch: gh-pages
+          folder: public
+          clean: true
+          single-commit: true

.github/workflows/update-theme.yaml

@@ -0,0 +1,38 @@
+name: Update theme
+
+# Controls when the workflow will run
+on:
+  schedule:
+    # Update theme automatically everyday at 00:00 UTC
+    - cron: "0 0 * * *"
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  update-theme:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the
+      # added or changed files to the repository.
+      contents: write
+    
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v3
+        with:
+          hugo-version: "latest"
+          extended: true
+
+      - name: Update theme
+        run: hugo mod get -u github.com/geekifan/hugo-theme-chirpy
+
+      - name: Tidy go.mod, go.sum
+        run: hugo mod tidy
+
+      - name: Commit changes
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "CI: Update theme"