Initial provider implementation (#18)

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

examples/upgrade/Pulumi.yaml

@@ -0,0 +1,187 @@
+name: provider-docker-build
+runtime: yaml
+plugins:
+  providers:
+    - name: docker-build
+      path: ../../bin
+
+resources:
+  # docker buildx build -f app/Dockerfile.multiPlatform --platform plan9/amd64,plan9/386 app
+  multiPlatform:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.multiPlatform"
+      context:
+        location: "./app"
+      platforms:
+        - plan9/amd64
+        - plan9/386
+
+  # docker buildx build --output=type=registry app
+  registryPush:
+    type: docker-build:Image
+    properties:
+      push: false
+      context:
+        location: "./app"
+      tags: ["docker.io/pulumibot/buildkit-e2e:example"]
+      exports:
+        - registry:
+            ociMediaTypes: true
+            push: false # Omit this to actually push images.
+
+  # docker buildx build --cache-to=type=local,dest=tmp/cache,mode=max --cache-from=type=local,src=tmp/cache app
+  cached:
+    type: docker-build:Image
+    properties:
+      push: false
+      context:
+        location: "./app"
+      cacheTo:
+        - local:
+            dest: tmp/cache
+            mode: max
+      cacheFrom:
+        - local:
+            src: tmp/cache
+
+  # docker buildx build -f app/Dockerfile.buildArgs --build-arg SET_ME_TO_TRUE=true app
+  buildArgs:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.buildArgs"
+      context:
+        location: "./app"
+      buildArgs:
+        SET_ME_TO_TRUE: "true"
+
+  # docker buildx build -f app/Dockerfile.extraHosts --add-host metadata.google.internal:169.254.169.254 app
+  extraHosts:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.extraHosts"
+      context:
+        location: "./app"
+      addHosts:
+        - "metadata.google.internal:169.254.169.254"
+
+  # docker buildx build -f app/Dockerfile.sshMount --ssh default app
+  sshMount:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.sshMount"
+      context:
+        location: "./app"
+      ssh:
+        - id: default
+
+  # PASSWORD=hunter2 docker buildx build -f app/Dockerfile.secrets --secret id=password,env=PASSWORD app
+  secrets:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.secrets"
+      context:
+        location: "./app"
+      secrets:
+        password: hunter2
+
+  # docker buildx build --label "description=This image will get a descriptive label 👍" app
+  labels:
+    type: docker-build:Image
+    properties:
+      push: false
+      context:
+        location: "./app"
+      labels:
+        description: "This image will get a descriptive label 👍"
+
+  # docker buildx build -f app/Dockerfile.target --target build-me app
+  target:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.target"
+      context:
+        location: "./app"
+      target: "build-me"
+
+  # docker buildx build -f app/Dockerfile.namedContexts \
+  #   --build-context golang:latest=docker-image://golang@sha256:b8e62cf593cdaff36efd90aa3a37de268e6781a2e68c6610940c48f7cdf36984 app
+  namedContexts:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        location: "./app/Dockerfile.namedContexts"
+      context:
+        location: "./app"
+        named:
+          "golang:latest":
+            location: "docker-image://golang@sha256:b8e62cf593cdaff36efd90aa3a37de268e6781a2e68c6610940c48f7cdf36984"
+
+  # docker buildx build https://raw.githubusercontent.com/pulumi/pulumi-docker/api-types/provider/testdata/Dockerfile
+  remoteContext:
+    type: docker-build:Image
+    properties:
+      push: false
+      context:
+        location: "https://raw.githubusercontent.com/pulumi/pulumi-docker/api-types/provider/testdata/Dockerfile"
+
+  # docker buildx build -f - https://github.com/docker-library/hello-world.git <<EOF
+  #  FROM busybox
+  #  COPY hello.c ./
+  #  EOF
+  remoteContextWithInline:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        inline: |
+          FROM busybox
+          COPY hello.c ./
+      context:
+        location: "https://github.com/docker-library/hello-world.git"
+
+  # echo "FROM alpine" | docker buildx build -f - .
+  inline:
+    type: docker-build:Image
+    properties:
+      push: false
+      dockerfile:
+        inline: |
+          FROM alpine
+          RUN echo "This uses an inline Dockerfile! 👍"
+      context:
+        location: "./app"
+
+  # docker buildx build --load .
+  dockerLoad:
+    type: docker-build:Image
+    properties:
+      push: false
+      context:
+        location: "./app"
+      exports:
+        - docker:
+            tar: true
+
+  # docker buildx build - < app/Dockerfile.emptyContext
+  #emptyContext:
+  #  type: docker-build:Image
+  #  properties:
+  #    file: "app/Dockerfile.emptyContext"
+  #    context: "-"
+
+outputs:
+  platforms: ${multiPlatform.platforms}