Changes to Create a spec

added the new required request property os

added the new optional request property sandbox

added the optional property sandbox to the response with the 201 status

added the required property os to the response with the 201 status

added the new optional request property fallback

added the optional property fallback to the response with the 201 status

removed the enum value riscv64 of the request property architecture/allOf[#/components/schemas/Architecture]

removed the riscv64 enum value from the architecture/allOf[#/components/schemas/Architecture] response property for the response status 201

endpoint added