Add Node.js example

examples/aws-nodejs/.dockerignore

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+index.ts
+node_modules
+package.json
+Pulumi.yaml
+tsconfig.json

examples/aws-nodejs/Dockerfile

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+FROM ubuntu
+
+RUN apt-get update && apt-get install -qy python-is-python3 python3

examples/aws-nodejs/Pulumi.yaml

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+name: docker-buildkit-aws-typescript
+description: Demonstrate Docker Buildkit usage with AWS and TypeScript.
+runtime:
+  name: nodejs

examples/aws-nodejs/index.ts

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+import * as aws from "@pulumi/aws";
+import * as dockerBuildkit from "@MaterializeInc/pulumi-docker-buildkit";
+
+const repo = new aws.ecr.Repository("repo");
+
+const registryInfo = repo.registryId.apply(async id => {
+    const credentials = await aws.ecr.getCredentials({ registryId: id });
+    const authToken = Buffer.from(credentials.authorizationToken, "base64");
+    const [username, password] = authToken.toString().split(":");
+    return { server: credentials.proxyEndpoint, username: username, password: password };
+});
+
+export const image = new dockerBuildkit.Image(
+    "image",
+    { name: repo.repositoryUrl, registry: registryInfo },
+).repoDigest;