CI job to validate openapi syntax of the definitions

#!/bin/bash

specfiles=$(ls | egrep "^[^.]*.(json|yaml)")

fres=0

for i in $specfiles ; do

    echo "-- Validating OpenAPI file $i..."

    swagger-tools validate $i

    res=$?

    fres=$(($fres||$res))

    echo -e "-- Validator returned $res.\n"

done

echo "-- Final validator returns $fres."

exit $fres