.github: scope artifact to current app to avoid upload races #81

Job	Run time
container (ntpd) / build (amd64)	5m 11s
container (system) / build (amd64)	13m 36s
container (neofetch) / build (amd64)	7m 21s
container (nftables) / build (arm64)	3m 52s
container (neofetch) / build (arm64)	7m 25s
container (system) / build (arm64)	14m 10s
container (nftables) / build (amd64)	4m 33s
container (httpd) / build (arm64)	4m 12s
container (ntpd) / build (arm64)	5m 39s
container (httpd) / build (amd64)	3m 59s
container (httpd) / push	20s
container (nftables) / push	19s
container (ntpd) / push	25s
container (neofetch) / push	18s
container (system) / push	31s
	1h 11m 51s

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