Fastlane match with keychain removal

Fastfile

# If the match keychain is present, remove it
def remove_keychain_if_exists
 delete_keychain(name: <keychainName>) if File.exist? File.expand_path "~/Library/Keychains/#{<keychainName>}-db" # The File.expand_path is crutial, otherwise File.exist? will not work!!!!!!!
end

keychainPassword = SecureRandom.base64(16) # We need a key for the keychain, so nobody can extract the certificates out while the build is happening

remove_keychain_if_exists

create_keychain(
 name: <keychainName>,
 password: keychainPassword,
 unlock: true,
 timeout: false
)

match(
 username: <username>,
 app_identifier: <app_identifier>, 
 type: <type>, 
 shallow_clone: true,
 clone_branch_directly: true, 
 verbose: true,
 keychain_name: <keychainName>,
 keychain_password: keychainPassword
)

gym(
 scheme: <schemeName>,
 configuration: <conf>,
 clean: true,
 export_method: <export_method>,
 export_team_id: <username>
)

remove_keychain_if_exists