Load properties from a given file within the project.

loadProperties.gradle

def propertiesFrom(filename) {
    def properties = new Properties()
    def file = rootProject.file(filename)
    if (file.exists()) {
        properties.load(new FileInputStream(file))
    } else {
        System.out.println("[WARNING] Properties file ${filename} not found. Returning empty properties.")
    }
    return properties
}