debugging: for auth errors

Add debugging to help identify why we get no auth.

docker.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/cenkalti/backoff/v4"
 	"github.com/containerd/platforms"
+	"github.com/cpuguy83/dockercfg"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/filters"
@@ -1321,7 +1322,17 @@ func (p *DockerProvider) ReuseOrCreateContainer(ctx context.Context, req Contain
 func (p *DockerProvider) attemptToPullImage(ctx context.Context, tag string, pullOpt image.PullOptions) error {
 	registry, imageAuth, err := DockerImageAuth(ctx, tag)
 	if err != nil {
-		p.Logger.Printf("Failed to get image auth for %s. Setting empty credentials for the image: %s. Error is: %s", registry, tag, err)
+		cfg, errc := getDockerConfig()
+		path, errp := dockercfg.UserHomeConfigPath()
+		p.Logger.Printf("DOCKER_AUTH_CONFIG: %q DOCKER_CONFIG: %q path: %q, config: %#v errc: %v errp: %v",
+			os.Getenv("DOCKER_AUTH_CONFIG"),
+			os.Getenv("DOCKER_CONFIG"),
+			path,
+			cfg,
+			errc,
+			errp,
+		)
+		p.Logger.Printf("Failed to get image auth for %s. Setting empty credentials for the image: %s. Error is: %s Config: %#v", registry, tag, err)
 	} else {
 		// see https://github.com/docker/docs/blob/e8e1204f914767128814dca0ea008644709c117f/engine/api/sdk/examples.md?plain=1#L649-L657
 		encodedJSON, err := json.Marshal(imageAuth)