Cross-compile Go amd64 binaries for macOS, Windows and Linux from a single CI environment

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At the moment, we have a CI environment for each platform we support. This has a number of negative effects including:

• Requires us to maintain CI pipelines for each of these platforms which is already a chore, but also becomes even more painful whenever the CI pipeline for a specific platform breaks due to packaging issues (looking at you Windows)
• It is currently difficult to pin a specific Go version for the Windows CI pipeline since it relies on MSYS which does not support installation of older package versions

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Since Go supports cross-compiling I wonder if it could be worthwhile to cross-compile Go binaries from a single environment. However, if this still requires compiling ffmpeg in different environments then this might not be as useful...but it at the very least would allow us to pin Go versions and use a single environment for compiling Go code?

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Start by mapping the existing CI environment for each supported platform and reviewing how Go compilation, MSYS, and ffmpeg packaging are handled. Compare whether one environment can produce macOS, Windows, and Linux binaries while preserving the required ffmpeg builds; done means the separate pipelines can be reduced without breaking packaging or Go version pinning.