Error: BundleType must be either YAML or JSON

I'm trying to deploy a lambda function written in go and getting the following error:

```
Zipping files into /tmp/#10-Resources:
- myfunc:
Properties:
Alias: main
CurrentVersion: ''
Name: myfunc
TargetVersion: 0.0.10
Type: AWS::Lambda::Function
version: 0.0.10.zip
Uploading zip to s3://my-bucket/myfunc/#10-Resources:
- myfunc:
Properties:
Alias: main
CurrentVersion: ''
Name: myfunc
TargetVersion: 0.0.10
Type: AWS::Lambda::Function
version: 0.0.10.zip
Registering revision for application 'MyFunc'
Failed CodeDeploy post-build step; exception follows.
BundleType must be either YAML or JSON (Service: AmazonCodeDeploy; Status Code: 400; Error Code: InvalidRevisionException; Request ID: 5c46c0da-2124-11e8-9f19-914d46cbd854)
com.amazonaws.services.codedeploy.model.InvalidRevisionException: BundleType must be either YAML or JSON (Service: AmazonCodeDeploy; Status Code: 400; Error Code: InvalidRevisionException; Request ID: 5c46c0da-2124-11e8-9f19-914d46cbd854)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1639)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1304)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1056)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:743)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:717)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:699)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:667)
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:649)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:513)
at com.amazonaws.services.codedeploy.AmazonCodeDeployClient.doInvoke(AmazonCodeDeployClient.java:3358)
at com.amazonaws.services.codedeploy.AmazonCodeDeployClient.invoke(AmazonCodeDeployClient.java:3334)
at com.amazonaws.services.codedeploy.AmazonCodeDeployClient.executeRegisterApplicationRevision(AmazonCodeDeployClient.java:2839)
at com.amazonaws.services.codedeploy.AmazonCodeDeployClient.registerApplicationRevision(AmazonCodeDeployClient.java:2813)
at com.amazonaws.codedeploy.AWSCodeDeployPublisher.registerRevision(AWSCodeDeployPublisher.java:403)
at com.amazonaws.codedeploy.AWSCodeDeployPublisher.perform(AWSCodeDeployPublisher.java:232)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:81)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1749)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
```

Comienza reproduciendo el despliegue de Jenkins y siguiendo los puntos de entrada AWSCodeDeployPublisher.perform y registerRevision que aparecen en el stack trace. Determina por qué la revisión de CodeDeploy es rechazada con el error BundleType y, a continuación, verifica que un despliegue de Go Lambda se registre correctamente.

Escrito por el modelo de indexación a partir del texto del issue.