Keep repo key registered in alpine, and simplify Dockerfiles #119

Job	Run time
Generate Jobs	37s
1.25.4, 1.25.4-perl, 1.25.4-otel	3m 22s
1.25.4-alpine-slim, 1.25.4-alpine, 1.25.4-alpine-perl, 1.25.4-alpine-otel	2m 33s
1.24.0, 1.24.0-perl	2m 52s
1.24.0-alpine-slim, 1.24.0-alpine, 1.24.0-alpine-perl	2m 18s
1.25.4, 1.25.4-perl, 1.25.4-otel (i386)	21m 48s
1.25.4-alpine-slim, 1.25.4-alpine, 1.25.4-alpine-perl, 1.25.4-alpine-otel (i386)	23m 36s
1.24.0, 1.24.0-perl (i386)	6m 59s
1.24.0-alpine-slim, 1.24.0-alpine, 1.24.0-alpine-perl (i386)	6m 3s
	1h 10m 8s

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