Housekeeping (#8)

* Rename the provider to dockerbuild.
* Add Makefile targets required by CI.
* Add per-language test targets compatible with CI.
* Fix broken example yaml.
* Add gitignore exclusions to fix SDK generation in CI.
* Fix lint errors.
* Vendor pulumi CLI via `tools.go` instead of `.pulumi`.
* Consolidate `go.mod`s into one file, with a minimal `go.mod` for the
Go SDK.
* Add codecov.

sdk/dotnet/Provider.cs

@@ -7,9 +7,9 @@ using System.Collections.Immutable;
 using System.Threading.Tasks;
 using Pulumi.Serialization;
 
-namespace Pulumi.DockerNative
+namespace Pulumi.Dockerbuild
 {
-    [DockerNativeResourceType("pulumi:providers:docker-native")]
+    [DockerbuildResourceType("pulumi:providers:dockerbuild")]
     public partial class Provider : global::Pulumi.ProviderResource
     {
         /// <summary>
@@ -20,7 +20,7 @@ namespace Pulumi.DockerNative
         /// <param name="args">The arguments used to populate this resource's properties</param>
         /// <param name="options">A bag of options that control this resource's behavior</param>
         public Provider(string name, ProviderArgs? args = null, CustomResourceOptions? options = null)
-            : base("docker-native", name, args ?? new ProviderArgs(), MakeResourceOptions(options, ""))
+            : base("dockerbuild", name, args ?? new ProviderArgs(), MakeResourceOptions(options, ""))
         {
         }
 
@@ -29,7 +29,7 @@ namespace Pulumi.DockerNative
             var defaultOptions = new CustomResourceOptions
             {
                 Version = Utilities.Version,
-                PluginDownloadURL = "github.com/pulumi/pulumi-docker-native",
+                PluginDownloadURL = "github.com/pulumi/pulumi-dockerbuild",
             };
             var merged = CustomResourceOptions.Merge(defaultOptions, options);
             // Override the ID if one was specified for consistency with other language SDKs.