.github: adjust perms in parent workflow as well #34

Job	Run time
supervisor (curios-ntpd) / build (amd64)	4m 4s
supervisor (curios) / build (amd64)	5m 21s
supervisor (curios-nftables) / build (amd64)	1m 45s
supervisor (curios-ntpd) / build (arm64)	4m 22s
supervisor (curios) / build (arm64)	5m 38s
supervisor (curios-httpd) / build (amd64)	1m 39s
supervisor (curios-httpd) / build (arm64)	1m 39s
supervisor (curios-nftables) / build (arm64)	1m 50s
supervisor (curios-httpd) / push	14s
supervisor (curios-nftables) / push	19s
supervisor (curios-ntpd) / push	29s
supervisor (curios) / push	28s
	27m 48s

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