Fix ARM runner build issues by installing C++ build tools

- Add automatic detection and installation of build-essential
- Support Ubuntu/Debian, Alpine, and RHEL/CentOS ARM runners
- Resolves 'c++: No such file or directory' error for native modules
- Ensures bufferutil and other native dependencies can compile

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.forgejo/workflows/build.yml

@@ -15,6 +15,18 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v4
 
+      - name: Install build dependencies
+        run: |
+          if command -v apt-get >/dev/null 2>&1; then
+            sudo apt-get update
+            sudo apt-get install -y build-essential python3-dev
+          elif command -v apk >/dev/null 2>&1; then
+            sudo apk add --no-cache build-base python3-dev
+          elif command -v yum >/dev/null 2>&1; then
+            sudo yum groupinstall -y "Development Tools"
+            sudo yum install -y python3-devel
+          fi
+
       - name: Clean NextJS cache
         run: rm -rf .next