Awesome, let us know how it goes, or if you have any questions! 
I’d also suggest you to use the BITRISE_BUILD_NUMBER as the build number, for automatic build number “bump” - it makes identifying builds way easier. You can also use the env var in Gradle configs directly, via System.getenv("BITRISE_BUILD_NUMBER")
def bitriseBuildNumber = System.getenv("BITRISE_BUILD_NUMBER")
def buildNumber = bitriseBuildNumber != null ? bitriseBuildNumber : "0"
or
def buildNumber = System.getenv("BITRISE_BUILD_NUMBER") ?: "0"
Source: