chore: matrix_json variable #64

Job	Run time
prepare	41s
build (15, Dockerfile-15)	37s
build (orioledb-17, Dockerfile-orioledb-17)	41s
build_release_image (15, Dockerfile-15, amd64)	3m 53s
build_release_image (15, Dockerfile-15, arm64)	4m 29s
build_release_image (orioledb-17, Dockerfile-orioledb-17, amd64)	3m 15s
build_release_image (orioledb-17, Dockerfile-orioledb-17, arm64)	4m 22s
merge_manifest (15, Dockerfile-15)	43s
merge_manifest (orioledb-17, Dockerfile-orioledb-17)	49s
get_publish_version	36s
publish (15.8.1.017, arm64) / mirror	1m 51s
publish (15.8.1.017, amd64) / mirror	50s
publish (17.0.1.007-orioledb, arm64) / mirror	1m 16s
publish (17.0.1.007-orioledb, amd64) / mirror	1m 4s
	25m 7s

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