Add GitHub Copilot Setup Steps workflow and devcontainer

.devcontainer/devcontainer.json

@@ -0,0 +1,30 @@
+{
+  "name": "Awesome Java UI - Java 25",
+  "image": "mcr.microsoft.com/devcontainers/java:25",
+  "features": {
+    "ghcr.io/devcontainers/features/java:1": {
+      "version": "25",
+      "installMaven": "false",
+      "installGradle": "false"
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "vscjava.vscode-java-pack",
+        "GitHub.copilot",
+        "GitHub.copilot-chat"
+      ],
+      "settings": {
+        "java.configuration.runtimes": [
+          {
+            "name": "JavaSE-25",
+            "path": "/usr/local/sdkman/candidates/java/current"
+          }
+        ]
+      }
+    }
+  },
+  "postCreateCommand": "bash -c 'cd /tmp && curl -Ls https://sh.jbang.dev -o jbang-install.sh && bash jbang-install.sh app setup && rm jbang-install.sh'",
+  "remoteUser": "vscode"
+}

.github/copilot-instructions.md

@@ -71,6 +71,20 @@ The front matter schema:
 - Automatically builds and deploys to GitHub Pages on push to main
 - Uses JBang to run the build script in the CI environment
 
+### Copilot Java 25 Workflow
+- GitHub Actions workflow in `.github/workflows/copilot-setup-steps.yml`
+- Ensures Java 25 environment for Copilot agents on pull requests
+- Includes JBang setup with caching for improved performance
+- Validates the build process with Java 25
+- Can be manually triggered via workflow_dispatch
+
+### Development Environment
+- DevContainer configuration in `.devcontainer/devcontainer.json`
+- Pre-configured with Java 25 for GitHub Codespaces and VS Code
+- Includes GitHub Copilot extensions and Java development tools
+- Automatically sets up JBang on container creation
+- Provides consistent development environment across all contributors
+
 ### Local Development
 - Output directory (`_site/`) is gitignored
 - Rebuild the site locally after markdown changes to preview

.github/workflows/build-site.yml

@@ -38,7 +38,7 @@ jobs:
           java-version: '25'
 
       - name: Setup JBang
-        uses: jbangdev/setup-jbang@main
+        uses: jbangdev/setup-jbang@v0.1.1
 
       - name: Build site with JBang
         # this outputs to the /docs folder

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,46 @@
+name: "Copilot Setup Steps"
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # This job name MUST be exactly "copilot-setup-steps"
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 25
+        uses: actions/setup-java@v4
+        with:
+          java-version: '25'
+          distribution: 'temurin'
+
+      - name: Setup JBang
+        uses: jbangdev/setup-jbang@v0.1.1
+
+      - name: Verify Java version
+        run: java -version
+
+      - name: Cache JBang dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.jbang
+          key: ${{ runner.os }}-jbang-${{ hashFiles('**/*.java') }}
+          restore-keys: |
+            ${{ runner.os }}-jbang-
+
+      - name: Download dependencies
+        run: jbang run --fresh build.java

README.md

@@ -6,6 +6,15 @@ Visit [https://awesome-java-ui.com](https://awesome-java-ui.com)
 
 ## Quick Start
 
+### Option 1: GitHub Codespaces or VS Code DevContainer
+The easiest way to get started is with our pre-configured development environment:
+
+1. Open this repository in GitHub Codespaces or VS Code with DevContainers
+2. The environment will automatically set up Java 25 and JBang
+3. Run `jbang run build.java` to build the site
+4. Open `_site/index.html` in a browser to view the site
+
+### Option 2: Local Development
 **Prerequisites:**
 - Java 25+
 - JBang