Feature: Make pizza oven service deployable/buildable to 32 bit systems

[jpmcb]

Currently, the minimum free disk env variable is parsed as uint64:

pizza/main.go

Lines 71 to 78 in 51ed9ca

	// Validates the provided minimum free disk int is parsable as a uint64
	//
	// TODO - should dynamically check file system bit size after compilation.
	// 64 bit wide words should be fine for almost all use cases for now.
	minFreeDiskUint64, err := strconv.ParseUint(minFreeDisk, 10, 64)
	if err != nil {
	sugarLogger.Fatalf(": %s", err.Error())
	}

This is mostly fine since I'd imagine we're only going to deploy this to 64 bit systems.

A stretch goal / nice to have someday would be to make this dynamic for the system that is being compiled to. I think this would be a simple check against bits.UintSize (which should be set at compile time).

The tricky part will be cross building images on different machines with the right bit lengths.

But again, I anticipate only really needing 64 bit systems, so this is a stretch goal.