go1.20+: Refuse to work if cgo is enabled

On go1.20+ it is no longer possible to directly copy a cgo-enabled
library into a docker container. For this reason, this commit adds a
flag to commands that automatically make them fail with an appropriate
message if cgo is enabled.

internal/cli/requirements.go

@@ -9,6 +9,9 @@ import (
 type Requirements struct {
 	// Do we need an installed distillery?
 	NeedsDistillery bool
+
+	// Automatically fail when cgo is enabled?
+	FailOnCgo bool
 }
 
 // AllowsFlag checks if the provided flag may be passed to fullfill this requirement