Add Java CLI for converting Android AVD skins to Codename One

.github/workflows/avd-skin-conversion.yml

@@ -0,0 +1,54 @@
+name: AVD Skin Conversion
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/avd-skin-conversion.yml'
+      - 'AvdSkinToCodenameOneSkin.java'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  convert:
+    if: ${{ github.event_name != 'pull_request' || github.event.action != 'synchronize' || github.event.before != '0000000000000000000000000000000000000000' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Install WebP conversion tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y webp
+
+      - name: Download sample AVD skin
+        run: |
+          set -euo pipefail
+          curl -L --fail --retry 5 --retry-delay 5 -o skins.zip https://github.com/larskristianhaga/Android-emulator-skins/archive/refs/heads/master.zip
+          mkdir -p skins
+          unzip -q skins.zip "Android-emulator-skins-master/nexus_10/*" -d skins
+
+      - name: Convert AVD skin to Codename One skin
+        run: |
+          mkdir -p build
+          java AvdSkinToCodenameOneSkin.java skins/Android-emulator-skins-master/nexus_10 build/nexus_10.skin
+
+      - name: Validate Codename One skin archive
+        run: |
+          test -f build/nexus_10.skin
+          unzip -l build/nexus_10.skin
+
+      - name: Upload converted skin artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: nexus-10-codenameone-skin
+          path: build/nexus_10.skin