Added ability to specify a directory of config files #54

Job	Run time
Go tests	55s
golangci-lint	47s
Build Prometheus for all architectures (0)	3m 19s
Build Prometheus for all architectures (1)	1m 7s
Go tests with previous Go version	51s
Go tests on Windows	1m 59s
Build Prometheus for all architectures (2)	51s
Build Prometheus for all architectures (3)	1m 8s
Build Prometheus for all architectures (4)	1m 5s
Build Prometheus for all architectures (5)	1m 21s
Build Prometheus for all architectures (6)	1m 9s
Build Prometheus for all architectures (7)	57s
Build Prometheus for all architectures (8)	1m 14s
Build Prometheus for all architectures (9)	58s
Build Prometheus for all architectures (10)	1m 12s
Build Prometheus for all architectures (11)	1m 9s
codeql / Analyze (go)	1m 54s
Publish release artifacts	0s
Publish main branch artifacts	0s
	21m 56s

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