Initial provider implementation (#18)

This brings over the initial buildx prototype from pulumi/pulumi-docker
and fixes various build and release issues.

sdk/dotnet/Outputs/CacheToRegistry.cs

@@ -0,0 +1,84 @@
+// *** WARNING: this file was generated by pulumi. ***
+// *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Threading.Tasks;
+using Pulumi.Serialization;
+
+namespace Pulumi.DockerBuild.Outputs
+{
+
+    [OutputType]
+    public sealed class CacheToRegistry
+    {
+        /// <summary>
+        /// The compression type to use.
+        /// </summary>
+        public readonly Pulumi.DockerBuild.CompressionType? Compression;
+        /// <summary>
+        /// Compression level from 0 to 22.
+        /// </summary>
+        public readonly int? CompressionLevel;
+        /// <summary>
+        /// Forcefully apply compression.
+        /// </summary>
+        public readonly bool? ForceCompression;
+        /// <summary>
+        /// Ignore errors caused by failed cache exports.
+        /// </summary>
+        public readonly bool? IgnoreError;
+        /// <summary>
+        /// Export cache manifest as an OCI-compatible image manifest instead of a
+        /// manifest list. Requires `ociMediaTypes` to also be `true`.
+        /// 
+        /// Some registries like AWS ECR will not work with caching if this is
+        /// `false`.
+        /// 
+        /// Defaults to `false` to match Docker's default behavior.
+        /// </summary>
+        public readonly bool? ImageManifest;
+        /// <summary>
+        /// The cache mode to use. Defaults to `min`.
+        /// </summary>
+        public readonly Pulumi.DockerBuild.CacheMode? Mode;
+        /// <summary>
+        /// Whether to use OCI media types in exported manifests. Defaults to
+        /// `true`.
+        /// </summary>
+        public readonly bool? OciMediaTypes;
+        /// <summary>
+        /// Fully qualified name of the cache image to import.
+        /// </summary>
+        public readonly string Ref;
+
+        [OutputConstructor]
+        private CacheToRegistry(
+            Pulumi.DockerBuild.CompressionType? compression,
+
+            int? compressionLevel,
+
+            bool? forceCompression,
+
+            bool? ignoreError,
+
+            bool? imageManifest,
+
+            Pulumi.DockerBuild.CacheMode? mode,
+
+            bool? ociMediaTypes,
+
+            string @ref)
+        {
+            Compression = compression;
+            CompressionLevel = compressionLevel;
+            ForceCompression = forceCompression;
+            IgnoreError = ignoreError;
+            ImageManifest = imageManifest;
+            Mode = mode;
+            OciMediaTypes = ociMediaTypes;
+            Ref = @ref;
+        }
+    }
+}