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/ExportDocker.cs

@@ -0,0 +1,77 @@
+// *** 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 ExportDocker
+    {
+        /// <summary>
+        /// Attach an arbitrary key/value annotation to the image.
+        /// </summary>
+        public readonly ImmutableDictionary<string, string>? Annotations;
+        /// <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>
+        /// The local export path.
+        /// </summary>
+        public readonly string? Dest;
+        /// <summary>
+        /// Forcefully apply compression.
+        /// </summary>
+        public readonly bool? ForceCompression;
+        /// <summary>
+        /// Specify images names to export. This is overridden if tags are already specified.
+        /// </summary>
+        public readonly ImmutableArray<string> Names;
+        /// <summary>
+        /// Use OCI media types in exporter manifests.
+        /// </summary>
+        public readonly bool? OciMediaTypes;
+        /// <summary>
+        /// Bundle the output into a tarball layout.
+        /// </summary>
+        public readonly bool? Tar;
+
+        [OutputConstructor]
+        private ExportDocker(
+            ImmutableDictionary<string, string>? annotations,
+
+            Pulumi.DockerBuild.CompressionType? compression,
+
+            int? compressionLevel,
+
+            string? dest,
+
+            bool? forceCompression,
+
+            ImmutableArray<string> names,
+
+            bool? ociMediaTypes,
+
+            bool? tar)
+        {
+            Annotations = annotations;
+            Compression = compression;
+            CompressionLevel = compressionLevel;
+            Dest = dest;
+            ForceCompression = forceCompression;
+            Names = names;
+            OciMediaTypes = ociMediaTypes;
+            Tar = tar;
+        }
+    }
+}