use cloud cred helpers if available

go.mod

@@ -3,6 +3,8 @@ module github.com/chainguard-dev/terraform-provider-ko
 go 1.18
 
 require (
+	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20220517224237-e6f29200ae04
+	github.com/chrismellard/docker-credential-acr-env v0.0.0-20220327082430-c57b701bfc08
 	github.com/google/go-containerregistry v0.12.1
 	github.com/google/ko v0.12.1-0.20221114184933-3cbbeb3ad3e0
 	github.com/hashicorp/go-cty v1.4.1-0.20200414143053-d3edf31b6320
@@ -47,9 +49,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.13.6 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.16.19 // indirect
 	github.com/aws/smithy-go v1.13.3 // indirect
-	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20220517224237-e6f29200ae04 // indirect
 	github.com/bgentry/speakeasy v0.1.0 // indirect
-	github.com/chrismellard/docker-credential-acr-env v0.0.0-20220327082430-c57b701bfc08 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.13.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dimchansky/utfbom v1.1.1 // indirect