Add gh actions workflow for building rpi image

.github/workflows/build_rpi.yml

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+name: Dispatched Build and publish RaspAP images
+
+permissions:
+  contents: write
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  build-raspap-image:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - arch: "32-bit"
+            pi_gen_version: "master"
+          - arch: "64-bit"
+            pi_gen_version: "arm64"
+      fail-fast: false
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # - name: Add RaspAP Stage
+      #   run: |
+      #     mkdir -p stage-raspap/package-raspap &&
+      #     {
+      #     cat > stage-raspap/package-raspap/00-run-chroot.sh <<-EOF
+      #     #!/bin/bash
+      #     apt-get update -y && apt-get install -y curl dhcpcd5 iptables procps
+      #     curl -sL https://install.raspap.com | bash -s -- --yes --openvpn 1 --restapi 1 --adblock 1 --wireguard 1 --tcp-bbr 1 --check 0
+
+      #     # Set Wi-Fi country to prevent RF kill
+      #     raspi-config nonint do_wifi_country "US"
+      #     EOF
+      #     } &&
+      #     chmod +x stage-raspap/package-raspap/00-run-chroot.sh &&
+      #     {
+      #     cat > stage-raspap/prerun.sh <<-EOF
+      #     #!/bin/bash -e
+      #     if [ ! -d "\${ROOTFS_DIR}" ]; then
+      #       copy_previous
+      #     fi
+      #     EOF
+      #     } &&
+      #     chmod +x stage-raspap/prerun.sh
+
+      - name: Build RaspAP Image
+        id: build
+        uses: usimd/pi-gen-action@v1
+        with:
+          image-name: "raspap-bookworm-${{ matrix.arch == '32-bit' && 'armhf' || 'arm64' }}-lite-${{ github.event.inputs.tag || github.ref_name }}"
+          enable-ssh: 1
+          stage-list: stage0 stage1 stage2
+          # stage-list: stage0 stage1 stage2 ./stage-raspap
+          verbose-output: true
+          pi-gen-version: ${{ matrix.pi_gen_version }}
+          pi-gen-repository: RaspAP/pi-gen
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: rpi-deploy-${{ matrix.arch }}.img.zip
+          path: ${{ steps.build.outputs.image-path }}

stage-custom/package-setup/00-run-chroot.sh

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+#!/bin/bash
+set -e
+
+mkdir -p /proc /dev /sys /run /tmp
+
+# Install required packages
+apt-get update
+apt-get install -y python3
+
+# Configure Wi-Fi
+mkdir -p /etc/wpa_supplicant
+
+cat << EOF > /etc/wpa_supplicant/wpa_supplicant.conf
+country=US
+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+
+network={
+    ssid="Your_SSID"
+    psk="Your_Password"
+}
+EOF
+
+chmod 600 /etc/wpa_supplicant/wpa_supplicant.conf
+
+# Set up a simple HTTP server
+cat << SERVER_EOF > /usr/local/bin/simple-http-server.py
+#!/usr/bin/env python3
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+class SimpleHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        self.send_response(200)
+        self.send_header('Content-type', 'text/plain')
+        self.end_headers()
+        self.wfile.write(b'Hello from Raspberry Pi!')
+
+if __name__ == '__main__':
+    server = HTTPServer(('0.0.0.0', 8080), SimpleHandler)
+    print('Starting server at http://0.0.0.0:8080')
+    server.serve_forever()
+SERVER_EOF
+chmod +x /usr/local/bin/simple-http-server.py
+
+# Create and enable a systemd service for the HTTP server
+cat << SERVICE_EOF > /etc/systemd/system/simple-http-server.service
+[Unit]
+Description=Simple HTTP Server
+After=network.target
+
+[Service]
+ExecStart=/usr/local/bin/simple-http-server.py
+Restart=always
+User=root
+
+[Install]
+WantedBy=multi-user.target
+SERVICE_EOF
+
+systemctl enable simple-http-server.service

stage-custom/prerun.sh

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+#!/bin/bash -e
+if [ ! -d "${ROOTFS_DIR}" ]; then
+  copy_previous
+fi