Initial provider implementation (#18)

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

examples/tests/dockerhub/.dockerignore

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+*

examples/tests/dockerhub/Pulumi.yaml

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+name: dockerhub
+description: Push to DockerHub with caching
+runtime: yaml
+plugins:
+  providers:
+    - name: docker-build
+      path: ../../../bin
+outputs:
+  ref: ${my-image.ref}
+resources:
+  my-image:
+    type: docker-build:Image
+    properties:
+      tags:
+        - docker.io/pulumibot/buildkit-e2e
+      push: true
+      context:
+        location: .
+      dockerfile:
+        inline: FROM alpine
+      cacheFrom:
+        - registry:
+            ref: docker.io/pulumibot/buildkit-e2e:cache
+      cacheTo:
+        - registry:
+            ref: docker.io/pulumibot/buildkit-e2e:cache
+      registries:
+        - username: pulumibot
+          address: docker.io
+          password: ${dockerHubPassword}
+config:
+  dockerHubPassword:
+    type: string
+    secret: true

examples/tests/ecr/.dockerignore

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+*

examples/tests/ecr/Pulumi.yaml

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+name: ecr
+description: Push to AWS ECR with caching
+runtime: yaml
+plugins:
+  providers:
+    - name: docker-build
+      path: ../../../bin
+outputs:
+  ref: ${my-image.ref}
+resources:
+  ecr-repository:
+    type: aws:ecr:Repository
+    properties:
+      forceDelete: true
+  my-image:
+    type: docker-build:Image
+    properties:
+      tags:
+        - ${ecr-repository.repositoryUrl}:latest
+      push: true
+      context:
+        location: .
+      dockerfile:
+        inline: FROM alpine
+      cacheFrom:
+        - registry:
+            ref: ${ecr-repository.repositoryUrl}:cache
+      cacheTo:
+        - registry:
+            ref: ${ecr-repository.repositoryUrl}:cache
+            imageManifest: true
+            ociMediaTypes: true
+      registries:
+        - username: ${auth-token.userName}
+          password: ${auth-token.password}
+          address: ${ecr-repository.repositoryUrl}
+variables:
+  auth-token:
+    fn::aws:ecr:getAuthorizationToken:
+      registryId: ${ecr-repository.registryId}

examples/tests/unauthenticated/.dockerignore

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+*

examples/tests/unauthenticated/Pulumi.yaml

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+name: dockerhub-unauthenticated
+description: Pull an image from Dockerhub without credentials
+runtime: yaml
+plugins:
+  providers:
+    - name: docker-build
+      path: ../../../bin
+resources:
+  my-image:
+    type: docker-build:Image
+    properties:
+      tags:
+        - alpine-local
+      load: true
+      push: false
+      context:
+        location: .
+      dockerfile:
+        inline: FROM alpine