Update GitHub Pages deploy flow for Astro site

Author: ReKylee

.github/workflows/deploy.yml

@@ -1,5 +1,5 @@
-# Workflow to build and deploy a SvelteKit website to GitHub Pages
-name: Deploy static SvelteKit content to Pages
+# Workflow to build and deploy an Astro website to GitHub Pages
+name: Deploy Astro site to Pages
 
 on:
     # Runs on pushes targeting the default branch
@@ -28,27 +28,24 @@ jobs:
             - name: Checkout
               uses: actions/checkout@v4
 
-            - name: Install Node.js
-              uses: actions/setup-node@v3
-              with:
-                  node-version: latest
-                  cache: npm
-
-            - name: Install dependencies
-              run: npm i
-
             - name: Setup Pages
               uses: actions/configure-pages@v4
               with:
-                  static_site_generator: "sveltekit"
-
-            - name: Build site
-              run: npm run build
-
-            - name: Upload artifact
-              uses: actions/upload-pages-artifact@v3
+                  static_site_generator: astro
+
+            - name: Set base path for project pages
+              shell: bash
+              run: |
+                  if [[ "${{ github.repository }}" == "${{ github.repository_owner }}.github.io" ]]; then
+                    echo "BASE_PATH=/" >> "$GITHUB_ENV"
+                  else
+                    echo "BASE_PATH=/${{ github.event.repository.name }}" >> "$GITHUB_ENV"
+                  fi
+
+            - name: Build Astro site and prepare Pages artifact
+              uses: withastro/action@v4
               with:
-                  path: "build/"
+                  package-manager: npm
 
     deploy:
         needs: build-site