Generating video preview fails if generated/tmp path does not exist (post cleanse)

[gq1869]

When /generated/tmp/ does not exist, Stash fails to generate video previews.

To fix this, we should implement a condition to check if the failing error is os.isnotexist(), then create the directory path and then reattempt the createtemp function.

So, in addition to the standard check on if err != nil, we would write:

	if err != nil && os.IsNotExist(err) {
		if p.Tmp == "" {
			return nil, fmt.Errorf("temporary directory path is empty")
		}
		if mkdirErr := os.MkdirAll(p.Tmp, 0755); mkdirErr != nil {
			return nil, fmt.Errorf("creating temp directory: %w", mkdirErr)
		}
		tmpFile, err = p.TempFile(pattern)
	}

	if err != nil {
		return nil, fmt.Errorf("creating temporary file: %w", err)
	}

[gq1869]

Possible root cause location:

stash/pkg/scene/generate/generator.go

Line 66 in d95e357

if err != nil {