make sure that EESSI version for which build is triggered matches with location of easystack file + fix URL in `create_directory_tarballs.sh` #15

Job	Run time
build (x86_64/intel/skylake_avx512/archspec-linux-6132)	38s
build (x86_64/intel/haswell/archspec-linux-E5-2680-v3)	1m 34s
build (x86_64/amd/zen2/Azure-CentOS7-7V12)	36s
build (x86_64/intel/sapphirerapids/AWS-Rocky8-8488C)	34s
build (x86_64/amd/zen3/Azure-CentOS7-7V73X)	39s
build (aarch64/a64fx/Deucalion-Rocky85)	36s
build (x86_64/amd/zen4/Azure-Alma8-9V33X)	32s
build (aarch64/neoverse_n1/Azure-Ubuntu20-Altra)	35s
build (aarch64/neoverse_v1/AWS-awslinux-graviton3)	1m 23s
build (x86_64/amd/zen4/Shinx-RHEL8-9654)	35s
build (aarch64/nvidia/grace/Jureca-Rocky95)	31s
build (aarch64/google/axion/GCP-axion)	34s
build (aarch64/neoverse_n1/AWS-awslinux-graviton2)	38s
	9m 25s

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