BUG/MEDIUM: ci: fix generating specification on github side #969

Job	Run time
HAProxy check commit message	4s
generate-specification	1m 11s
generate-models	1m 22s
lint-spec	13s
Build	20s
go mod tidy	8s
license-check	25s
golangci-lint	1m 7s
Tests	42s
Test equal	1m 11s
e2e on HAProxy (2.1)	50s
e2e on HAProxy (2.8)	50s
e2e on HAProxy (2.3)	51s
e2e on HAProxy (2.6)	48s
e2e on HAProxy (2.2)	51s
e2e on HAProxy (2.7)	52s
e2e on HAProxy (2.4)	48s
e2e on HAProxy (2.5)	48s
	13m 21s

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