Add comment for setting --provenance=false when building container images.

Author: normj

src/Amazon.Common.DotNetCli.Tools/DockerCLIWrapper.cs

@@ -30,6 +30,10 @@ public int Build(string workingDirectory, string dockerFile, string imageTag, st
 
             var arguments = new StringBuilder();
 
+            // The --provenance=false switch is added to force docker to not build an image index which is an image with a manifest.
+            // Lambda does not support containers of this type. This can be verified by running "docker inspect" on the build
+            // image. The mediaType should be application/vnd.docker.distribution.manifest.v2+json but without
+            // the --provenance=false the mediaType will be application/vnd.oci.image.index.v1+json.
             if (arm64Build)
             {
                 arguments.Append($"buildx build --platform linux/arm64 --provenance=false ");