* What went wrong:
Execution failed for task ':app:packageRelease'.
> A failure occurred while executing com.android.build.gradle.tasks.PackageAndroidArtifact$IncrementalSplitterRunnable
> com.android.ide.common.signing.KeytoolException: Failed to read key key from store "D:\xxx\android\key.jks": No key with alias 'key' found in keystore D:\xxx\android\key.jks
检查多次，文件名是没问题的！
最后问题出在，生成key时的命令，这里检测的并不是文件名，而是jks在生成时的定义的名称
官方命令：
keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload
正解：
android - No key with alias 'key' found in keystore flutter - Stack Overflow