Fix image stuttering (#3035)

* Fix image stuttering.

* Fix docker publishing for PRs

* Write tests for new square parameter.

* Simplify code for createImage.

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Co-authored-by: Deluan Quintão <deluan@navidrome.org>

core/artwork/sources.go

@@ -124,7 +124,7 @@ func fromFFmpegTag(ctx context.Context, ffmpeg ffmpeg.FFmpeg, path string) sourc
 
 func fromAlbum(ctx context.Context, a *artwork, id model.ArtworkID) sourceFunc {
 	return func() (io.ReadCloser, string, error) {
-		r, _, err := a.Get(ctx, id, 0)
+		r, _, err := a.Get(ctx, id, 0, false)
 		if err != nil {
 			return nil, "", err
 		}