Parallelize matrix images #86

Job	Run time
Check if docker files are compliant with templates	3s
Build package (centos,8, 11)	14m 40s
Build package (centos,8, 12)	14m 22s
Build package (centos,8, 13)	13m 48s
Build package (centos,8, 14)	15m 45s
Build package (centos,8, 15)	13m 55s
Build package (centos,7, 11)	15m 41s
Build package (centos,7, 12)	17m 30s
Build package (centos,7, 13)	15m 38s
Build package (centos,7, 14)	15m 50s
Build package (centos,7, 15)	15m 49s
Build package (oraclelinux,8, 11)	16m 36s
Build package (oraclelinux,8, 12)	22m 6s
Build package (oraclelinux,8, 13)	18m 39s
Build package (oraclelinux,8, 14)	20m 34s
Build package (oraclelinux,8, 15)	16m 39s
Build package (oraclelinux,7, 11)	20m 27s
Build package (oraclelinux,7, 12)	19m 7s
Build package (oraclelinux,7, 13)	15m 50s
Build package (oraclelinux,7, 14)	16m 5s
Build package (oraclelinux,7, 15)	17m 53s
Build package (almalinux,9, 11)	14m 10s
Build package (almalinux,9, 12)	15m 49s
Build package (almalinux,9, 13)	18m 9s
Build package (almalinux,9, 14)	14m 3s
Build package (almalinux,9, 15)	18m 41s
Build package (debian,buster)	34m 2s
Build package (debian,bullseye)	29m 34s
Build package (debian,bookworm)	32m 43s
Build package (ubuntu,bionic)	26m 47s
Build package (ubuntu,focal)	30m 3s
Build package (ubuntu,jammy)	31m 19s
Build package (ubuntu,kinetic)	40m 38s
Build package (pgxn)	1m 7s
	10h 44m 2s

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