Add linux/arm64 to cross-compile targets.
Add linux/arm64 to cross-compile targets.

rbwsam/helm,sushilkm/helm,helm/helm,yan234280533/helm,adamreese/helm,adamreese/deployment-manager,bacongobbler/helm,rbwsam/helm,flynnduism/helm,sushilkm/helm,michelleN/deployment-manager,bacongobbler/helm,SlickNik/helm,fibonacci1729/helm,FengyunPan/helm,SlickNik/helm,thomastaylor312/helm,technosophos/deployment-manager,flynnduism/helm,kdada/helm,eicnix/helm,qwangrepos/helm,technosophos/k8s-helm,michelleN/deployment-manager,jascott1/helm,michelleN/deployment-manager,adamreese/helm,qwangrepos/helm,iamzhout/helm,adamreese/deployment-manager,thomastaylor312/helm,FengyunPan/helm,michelleN/deployment-manager,fibonacci1729/helm,technosophos/deployment-manager,helm/helm,eicnix/helm,adamreese/deployment-manager,iamzhout/helm,adamreese/deployment-manager,yan234280533/helm,technosophos/deployment-manager,adamreese/deployment-manager,technosophos/deployment-manager,jascott1/helm,appscode/helm,technosophos/k8s-helm,kdada/helm,appscode/helm,technosophos/deployment-manager