ci: Add OpenAPI validation

We need to validate that OpenAPI YAML definition is not broken by each
and every pull request. The easiest way is to rely on the Docker image
provided by OpenAPITools, as it allows us to validate the definition
with one simple command.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

scripts/run_openapi_tests.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+set -x
+
+sudo docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli validate -i /local/vmm/src/api/openapi/cloud-hypervisor.yaml