Starting with the build stack
Linux 2021.09 Appflow tries to detect which version of the Android Gradle Plugin is used in the project.
If the plugin is < 7, Java 8 is used. If it is >= 7, then Java 11 is used.
If a specific version of Java is needed, it is possible to override the automatic detection using
OVERRIDE_JAVA_VERSION environment variable.
The environment variable
OVERRIDE_JAVA_VERSION can only be set
to an integer representing the major version:
11 are currently allowed.
1.8.0 is a valid version, it is not a valid input.
OVERRIDE_JAVA_VERSION is set to an invalid or unavailable version the build will fail.