ci: add ci for creating GitHub Release

Signed-off-by: David Bauer <mail@david-bauer.net>

.github/image-readme.md

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+# Asus Filogic Factory Image
+
+## Supported devices
+
+ - TUF-AX4200
+
+
+## Instructions
+
+1. Download the Factory-Initramfs image.
+   Place it into a web-server directory root as openwrt.bin.
+
+   ```
+   $ mkdir -p /tmp/openwrt-webroot
+   $ cp <openwrt-factory-initramfs> /tmp/openwrt-webroot/openwrt.bin
+   $ python3 -m http.server -d /tmp/openwrt-webroot 8080
+   ```
+
+2. Open the router configuration page. Complete the first-time setup wizard.
+   Enable SSH Access (with Password-Login) on the Router.
+   Find this Setting at Administration --> System
+
+    SSH-Port 22
+
+3. Connect to the device using ssh
+   ```
+   $ ssh admin@192.168.50.1
+   ```
+
+4. Modify the `/etc/hosts` file using `vi` on the device.
+   Add an entry to the bottom of the file that resolves to the computer serving the factory-initramfs image.
+   Name the DNS name `openwrtimage.lan`
+
+5. Transfer the OpenWrt factory-initramfs to the device by downloading it from the http server using wget
+   ```
+   wget -O /tmp/openwrt.bin http://openwrtimage.lan:8080/openwrt.bin
+   ```
+
+7. Erase the linux-partition
+
+   ```
+   $ mtd-erase -d linux
+   ```
+
+
+8. Write OpenWrt to the `linux` partition
+
+   ```
+   $ mtd-write -i /tmp/openwrt.bin -d linux
+   ```
+
+9. Power-Cycle your router.
+
+10. Transfer the OpenWrt sysupgrade image to the router using `scp`.
+
+    ```
+    $ scp -O /path/to/<openwrt-sysupgrade.bin> root@192.168.1.1:/tmp
+    ```
+
+11. Install OpenWrt persistently using `sysupgrade`.
+
+    ```
+    $ sysupgrade -n /tmp/<openwrt-sysupgrade.bin>
+    ```

.github/image.config

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+CONFIG_TARGET_mediatek=y
+CONFIG_TARGET_mediatek_filogic=y
+CONFIG_TARGET_MULTI_PROFILE=y
+CONFIG_TARGET_DEVICE_mediatek_filogic_DEVICE_asus_tuf-ax4200=y

.github/workflows/image.yml

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+name: Build and release images
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: Build images
+    runs-on: ubuntu-latest
+
+    container: ghcr.io/openwrt/tools:openwrt-23.05
+
+    permissions:
+      contents: read
+      packages: read
+
+    steps:
+      - name: Checkout master directory
+        uses: actions/checkout@v3
+        with:
+          path: openwrt
+
+      - name: Restore config
+        working-directory: openwrt
+        run: cp .github/image.config .config
+
+      - name: Fix permission
+        run: chown -R buildbot:buildbot openwrt
+
+      - name: Run make defconfig
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: make defconfig
+
+      - name: Build everything
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: make -j$(nproc) BUILD_LOG=1 || ret=$? .github/workflows/scripts/show_build_failures.sh
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: build-output
+          path: openwrt/bin/targets/mediatek/filogic
+
+
+  release:
+    name: Create Release
+    needs: build
+    if: github.ref_type == 'tag'
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      packages: read
+
+    steps:
+      - name: Checkout master directory
+        uses: actions/checkout@v3
+        with:
+          path: openwrt
+
+      - name: Download build output
+        uses: actions/download-artifact@v3
+        with:
+          name: build-output
+          path: build-output
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v1
+        with:
+          body_path: ${{ github.workspace }}/openwrt/.github/image-readme.md
+          files: |
+            build-output/openwrt-*-initramfs-kernel.bin