refactor: rename chain package to run and update references

Signed-off-by: Deluan <deluan@navidrome.org>

utils/run/run.go

@@ -0,0 +1,29 @@
+package run
+
+import "golang.org/x/sync/errgroup"
+
+// Sequentially runs the given functions sequentially,
+// If any function returns an error, it stops the execution and returns that error.
+// If all functions return nil, it returns nil.
+func Sequentially(fs ...func() error) error {
+	for _, f := range fs {
+		if err := f(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Parallel runs the given functions in parallel,
+// It waits for all functions to finish and returns the first error encountered.
+func Parallel(fs ...func() error) func() error {
+	return func() error {
+		g := errgroup.Group{}
+		for _, f := range fs {
+			g.Go(func() error {
+				return f()
+			})
+		}
+		return g.Wait()
+	}
+}