Set initial delay for periodic workers

app/src/main/java/eu/faircode/email/WorkerCleanup.java

@@ -163,6 +163,7 @@ public class WorkerCleanup extends Worker {
 
         PeriodicWorkRequest workRequest =
                 new PeriodicWorkRequest.Builder(WorkerCleanup.class, CLEANUP_INTERVAL, TimeUnit.HOURS)
+                        .setInitialDelay(CLEANUP_INTERVAL, TimeUnit.HOURS)
                         .setConstraints(constraints.build())
                         .build();
         WorkManager.getInstance(context)

app/src/main/java/eu/faircode/email/WorkerPoll.java

@@ -54,6 +54,7 @@ public class WorkerPoll extends Worker {
             Log.i("Queuing " + getName() + " every " + pollInterval + " minutes");
             PeriodicWorkRequest workRequest =
                     new PeriodicWorkRequest.Builder(WorkerPoll.class, pollInterval, TimeUnit.MINUTES)
+                            .setInitialDelay(pollInterval, TimeUnit.MINUTES)
                             .build();
             WorkManager.getInstance(context)
                     .enqueueUniquePeriodicWork(getName(), ExistingPeriodicWorkPolicy.REPLACE, workRequest);

app/src/main/java/eu/faircode/email/WorkerWatchdog.java

@@ -56,6 +56,7 @@ public class WorkerWatchdog extends Worker {
 
             PeriodicWorkRequest workRequest =
                     new PeriodicWorkRequest.Builder(WorkerWatchdog.class, WATCHDOG_INTERVAL, TimeUnit.MINUTES)
+                            .setInitialDelay(WATCHDOG_INTERVAL, TimeUnit.MINUTES)
                             .build();
             WorkManager.getInstance(context)
                     .enqueueUniquePeriodicWork(getName(), ExistingPeriodicWorkPolicy.KEEP, workRequest);