CI/CD

feat: Allow to configure notifications_sending_frequency #163

Job	Run time
Lint code	2m 35s
Test build docker image	6m 30s
Tests (0-2)	6m 7s
System tests (0-4)	6m 36s
Tests (1-2)	6m 26s
System tests (1-4)	6m 3s
System tests (2-4)	6m 39s
TODO	9s
Check for Zeitwerk errors	2m 3s
System tests (3-4)	6m 38s
Generate release	1s
Build and push image to Registry	1s
	49m 48s

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