Adds gunicorn workers slowly to avoid excessive cpu/memory load at st… #499

Job	Run time
build (16)	1m 55s
build (18)	2m 6s
test (16)	4m 2s
test (18)	5m 14s
test-lib (16, webapp-core)	4m 14s
test-lib (16, webapp-api-client)	3m 32s
test-lib (16, webapp-contentful)	3m 31s
test-lib (16, webapp-crud-demo)	3m 38s
test-lib (16, webapp-documents)	2m 57s
test-lib (16, webapp-notifications)	3m 5s
test-lib (16, webapp-emails)	3m 12s
test-lib (16, webapp-finances)	3m 44s
test-lib (16, webapp-generative-ai)	3m 0s
test-lib (18, webapp-core)	4m 0s
test-lib (18, webapp-api-client)	3m 18s
test-lib (18, webapp-contentful)	3m 49s
test-lib (18, webapp-crud-demo)	3m 13s
test-lib (18, webapp-documents)	3m 3s
test-lib (18, webapp-notifications)	3m 58s
test-lib (18, webapp-emails)	3m 12s
test-lib (18, webapp-finances)	3m 56s
test-lib (18, webapp-generative-ai)	3m 11s
	1h 15m 50s

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