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Drop creating secrets.yml and just use `SECRET_KEY_BASE` env #454

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Run time

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Job	Run time
Generate Jobs	36s
6.0.2	1m 53s
6.0.2-alpine3.21	3m 37s
6.0.2-alpine3.20	3m 23s
5.1.5	1m 35s
5.1.5-alpine3.21	3m 27s
5.1.5-alpine3.20	3m 2s
5.0.10	1m 44s
5.0.10-alpine3.21	2m 58s
5.0.10-alpine3.20	2m 40s
	24m 55s