Implement persistent alarm storage

components/alarms/alarm_store.h

@@ -0,0 +1,31 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#ifndef ALARM_STORE_H
+#define ALARM_STORE_H
+
+#include "time_manager.h"
+
+#include "sdkconfig.h"
+#include <stdbool.h>
+
+typedef struct {
+	bool set;
+	Time time;
+} Alarm;
+
+extern Alarm alarms[CONFIG_MAX_ALARMS];
+
+/**
+ * Initialize alarm store and load alarms from storage.
+ */
+void alarm_store_init(void);
+
+/**
+ * Save alarms to storage.
+ */
+void alarm_store_save(void);
+
+#endif