configs: fix default OCI load tag -> $CONTAINER_NAME #77

Job	Run time
container (system) / build (arm64)	13m 52s
container (ntpd) / build (arm64)	5m 42s
container (nftables) / build (amd64)	5m 30s
container (system) / build (amd64)	13m 14s
container (httpd) / build (arm64)	3m 50s
container (ntpd) / build (amd64)	4m 52s
container (nftables) / build (arm64)	4m 22s
container (httpd) / build (amd64)	5m 2s
container (neofetch) / build (amd64)	7m 24s
container (neofetch) / build (arm64)	7m 6s
container (httpd) / push	17s
container (nftables) / push	21s
container (ntpd) / push	27s
container (neofetch) / push	32s
container (system) / push	31s
	1h 13m 2s

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