Harden workflow download and avoid duplicate runs

Author: shai-almog

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

@@ -7,6 +7,10 @@ on:
       - 'AvdSkinToCodenameOneSkin.java'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   convert:
     runs-on: ubuntu-latest
@@ -22,14 +26,15 @@ jobs:
 
       - name: Download sample AVD skin
         run: |
-          curl -L --fail -o skins.zip https://codeload.github.com/google/android-emulator-skins/zip/refs/heads/main
+          set -euo pipefail
+          curl -L --fail --retry 5 --retry-delay 5 -o skins.zip https://codeload.github.com/google/android-emulator-skins/zip/refs/heads/master
           mkdir -p skins
-          unzip -q skins.zip "android-emulator-skins-main/Pixel_4/*" -d skins
+          unzip -q skins.zip "android-emulator-skins-master/Pixel_4/*" -d skins
 
       - name: Convert AVD skin to Codename One skin
         run: |
           mkdir -p build
-          java AvdSkinToCodenameOneSkin.java skins/android-emulator-skins-main/Pixel_4 build/Pixel_4.skin
+          java AvdSkinToCodenameOneSkin.java skins/android-emulator-skins-master/Pixel_4 build/Pixel_4.skin
 
       - name: Validate Codename One skin archive
         run: |