EVEREST-107 Add workflow for auto-updating PR's base branch (#1016) #3616

Job	Run time
CLI Integration Tests (1.23.x, false)	6m 54s
API Integration Tests (1.23.x, false)	12m 24s
Test (1.23.x, false)	10m 59s
Check	0s
CLI tests (test-all-operators) / CLI test-all-operators	8m 46s
CLI tests (test-mongo-operator) / CLI test-mongo-operator	7m 28s
CLI tests (test-namespaces) / CLI test-namespaces	10m 0s
CLI tests (test-pg-operator) / CLI test-pg-operator	7m 22s
CLI tests (test-pxc-operator) / CLI test-pxc-operator	7m 3s
Merge Gatekeeper	14s
	1h 11m 10s

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