Initial provider implementation (#18)

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

sdk/python/pulumi_docker_build/config/__init__.py

@@ -0,0 +1,8 @@
+# coding=utf-8
+# *** WARNING: this file was generated by pulumi-language-python. ***
+# *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+import sys
+from .vars import _ExportableConfig
+
+sys.modules[__name__].__class__ = _ExportableConfig

sdk/python/pulumi_docker_build/config/__init__.pyi

@@ -0,0 +1,19 @@
+# coding=utf-8
+# *** WARNING: this file was generated by pulumi-language-python. ***
+# *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+import copy
+import warnings
+import pulumi
+import pulumi.runtime
+from typing import Any, Mapping, Optional, Sequence, Union, overload
+from .. import _utilities
+from .. import outputs as _root_outputs
+
+host: str
+"""
+The build daemon's address.
+"""
+
+registries: Optional[str]
+

sdk/python/pulumi_docker_build/config/vars.py

@@ -0,0 +1,29 @@
+# coding=utf-8
+# *** WARNING: this file was generated by pulumi-language-python. ***
+# *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+import copy
+import warnings
+import pulumi
+import pulumi.runtime
+from typing import Any, Mapping, Optional, Sequence, Union, overload
+from .. import _utilities
+from .. import outputs as _root_outputs
+
+import types
+
+__config__ = pulumi.Config('docker-build')
+
+
+class _ExportableConfig(types.ModuleType):
+    @property
+    def host(self) -> str:
+        """
+        The build daemon's address.
+        """
+        return __config__.get('host') or (_utilities.get_env('DOCKER_HOST') or '')
+
+    @property
+    def registries(self) -> Optional[str]:
+        return __config__.get('registries')
+