Initial provider implementation (#18)

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

sdk/nodejs/package.json

@@ -1,11 +1,15 @@
 {
-    "name": "@pulumi/dockerbuild",
+    "name": "@pulumi/docker-build",
     "version": "${VERSION}",
     "keywords": [
-        "keywords"
+        "docker",
+        "buildkit",
+        "buildx",
+        "kind/native"
     ],
-    "homepage": "pulumi.com",
-    "repository": "https://github.com/pulumi/pulumi-dockerbuild",
+    "homepage": "https://pulumi.com",
+    "repository": "https://github.com/pulumi/pulumi-docker-build",
+    "license": "Apache-2.0",
     "scripts": {
         "build": "tsc"
     },
@@ -18,7 +22,6 @@
     },
     "pulumi": {
         "resource": true,
-        "name": "dockerbuild",
-        "server": "github.com/pulumi/pulumi-dockerbuild"
+        "name": "docker-build"
     }
 }