Fix ANDROID_NDK_HOME for ndk-version=latest

Author: marcprux

.github/workflows/test-action.yml

@@ -73,7 +73,7 @@ jobs:
       matrix:
         os: ['ubuntu-24.04', 'ubuntu-22.04', 'macos-13', 'macos-15']
         swift-version: ['6.0', '6.1', 'nightly-6.2']
-        ndk-version: ['27', '28']
+        ndk-version: ['27', 'latest']
     steps:
       - name: Checkout Action
         uses: actions/checkout@v4

action.yml

@@ -229,7 +229,7 @@ runs:
           # can set latest, which is currently 28. See:
           # https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md#environment-variables-2
           # https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md#environment-variables-1
-          echo "ANDROID_NDK_HOME=${ANDROID_NDK_LATEST_HOME}" >> $GITHUB_ENV
+        echo "ANDROID_NDK_HOME=${ANDROID_NDK_LATEST_HOME:-${ANDROID_NDK_HOME}}" >> $GITHUB_ENV
         elif [[ "${NDK_VERSION}" != '' ]]; then
           # we can set ndk-version to "27" or "27.0" or "27.2.12479018"
           NDK_BASE=$(dirname "${ANDROID_NDK_HOME}")