fix(bake): finish waiting for all printers

[goller]

Previously, we were only waiting for a single printer to complete. In multi-project builds we need to wait for all to finish.

[graphite-app]

The loop is calling printer.Wait() once for each project ID, but this doesn't match the actual number of printers that were added. This could lead to incorrect behavior since Wait() is designed to be called exactly once per added printer.

Instead of iterating over projectIDs, consider:

1. Tracking the number of printers added during execution and using that count for the loop, or
2. Modifying the SharedPrinter implementation to handle multiple Wait() calls correctly

The current approach might cause issues with synchronization or resource cleanup if the number of project IDs doesn't match the number of printers that were actually added.

Suggested change

	for range projectIDs {
	fmt.Fprintf(os.Stderr, "**waiting for one printer Wait***\n")
	_ = printer.Wait()
	for i := 0; i < printer.Count(); i++ {
	_ = printer.Wait()

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[graphite-app]

This change may cause a panic with 'negative WaitGroup counter' since printer.Wait() calls w.wg.Done() internally. Calling it multiple times (once per project ID) will decrement the counter beyond its initial value.

The solution should ensure that the number of Wait() calls matches the number of times the printer was added to the WaitGroup. Consider either:

1. Tracking how many times the printer was added and calling Wait() exactly that many times, or
2. Modifying the SharedPrinter.Wait() implementation to safely handle multiple calls

The current implementation of SharedPrinter.Wait() assumes it will be called exactly once per addition.

GitHub Flavored Markdown: No

Suggested change

	for range projectIDs {
	_ = printer.Wait()
	}
	// Only need to wait once for the printer to finish
	_ = printer.Wait()

Spotted by Diamond



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