Initial provider implementation (#18)

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

sdk/nodejs/config/vars.ts

@@ -0,0 +1,31 @@
+// *** WARNING: this file was generated by pulumi-language-nodejs. ***
+// *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+import * as pulumi from "@pulumi/pulumi";
+import * as inputs from "../types/input";
+import * as outputs from "../types/output";
+import * as enums from "../types/enums";
+import * as utilities from "../utilities";
+
+declare var exports: any;
+const __config = new pulumi.Config("docker-build");
+
+/**
+ * The build daemon's address.
+ */
+export declare const host: string;
+Object.defineProperty(exports, "host", {
+    get() {
+        return __config.get("host") ?? (utilities.getEnv("DOCKER_HOST") || "");
+    },
+    enumerable: true,
+});
+
+export declare const registries: outputs.Registry[] | undefined;
+Object.defineProperty(exports, "registries", {
+    get() {
+        return __config.getObject<outputs.Registry[]>("registries");
+    },
+    enumerable: true,
+});
+