Config: Allow scheduling of indexing and backup tasks #2495 #2608 #4243

Note that this is "bleeding edge" functionality and that the newly added
config option PHOTOPRISM_BACKUP_RETAIN can be set, but does not have any
effect yet. Feedback welcome!

Signed-off-by: Michael Mayer <michael@photoprism.app>

internal/workers/scheduler_test.go

@@ -0,0 +1,17 @@
+package workers
+
+import (
+	"testing"
+
+	"github.com/photoprism/photoprism/internal/config"
+)
+
+func TestNewJob(t *testing.T) {
+	if err := NewJob("", config.DefaultBackupSchedule, func() {}); err == nil {
+		t.Fatal("expected error")
+	}
+
+	if err := NewJob("test", "", func() {}); err != nil {
+		t.Fatal(err)
+	}
+}