Genuine question: how do I share code with other parties in the industry? Suppose that I'm working in the insurance industry and I want my company A to share t

Genuine question: how do I share code with other parties in the industry? Suppose that I'm working in the insurance industry and I want my company A to share the ownership of some code (and its execution) with company B. It's a redundant piece of code that would otherwise be implemented in both companies internally. We may share a repository. That's simple and clear. But who is going to run this code? How do I know that the code running is the one shown in the shared repository? When I see things like Hyperledger Fabric, I see a possible solution to this problem (although I don't know about the downsides of Fabric). I can ensure that, given the same inputs, all parties will produce the same outputs. This seems like a fair use for a permissioned blockchain and smart contracts. But what else is out there? How would you approach this problem?