How do you manage shared dev/test environments to avoid conflicts?

Hey everyone! I'd like to discuss a challenge that seems pretty common among dev teams. We often run into issues when multiple people use the same development or testing environments. Here are some typical scenarios: a developer might deploy a new version while someone else is in the middle of testing a bug fix, or another developer cleans up an environment just before a big presentation to stakeholders. It gets even trickier when two devs are testing integrations with the same IoT device, potentially messing up each other's tests.

We've tried using a spreadsheet or a wiki to book environments, but it hasn't worked perfectly—sometimes devs forget to check if the space is already booked. Recently, I ran into trouble when I couldn't present a feature to a customer because someone else overwrote my deployment. Sure, we could scale up and create more environments for each dev or team, but that would be costly and require extra maintenance. How do other teams handle this without running into conflicts?