Fix container image naming #105

Job	Run time
get-core-matrix	7s
get-core-matrix	7s
core-rpi3 / alpine-3.19	1m 24s
core-rpi3 / alpine-3.19	1m 24s
core-rpi4 / alpine-3.19	2m 36s
core-rpi4 / alpine-3.19	2m 36s
core-generic / opensuse-leap-15.6	6m 14s
core-generic / opensuse-leap-15.6	6m 14s
core-rpi3 / opensuse-leap-15.6	4m 40s
core-rpi3 / opensuse-leap-15.6	4m 40s
core-rpi3 / opensuse-tumbleweed	6m 14s
core-rpi3 / opensuse-tumbleweed	6m 14s
core-rpi4 / opensuse-leap-15.6	6m 20s
core-rpi4 / opensuse-leap-15.6	6m 20s
core-rpi4 / opensuse-tumbleweed	7m 52s
core-rpi4 / opensuse-tumbleweed	7m 52s
core-generic / fedora-40	18s
core-generic / fedora-40	5m 51s
core-rpi4 / ubuntu-20.04	8m 15s
core-rpi4 / ubuntu-20.04	8m 15s
core-rpi4 / ubuntu-22.04	9m 32s
core-rpi4 / ubuntu-22.04	9m 32s
core-generic / ubuntu-24.10	8m 25s
core-generic / ubuntu-24.10	8m 25s
	2h 9m 27s

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