Remove CI image build hacks #879

Job	Run time
doc (docs)	3m 42s
check (build)	2m 21s
doc (docs-gnocchi-web)	3m 45s
check (pep8)	2m 27s
test (py39, postgresql-file-upgrade-from-4.5)	4m 14s
test (py39, mysql-file)	5m 17s
test (py39, mysql-file-sqlalchemy14)	5m 14s
test (py39, mysql-swift)	5m 7s
test (py39, mysql-s3)	5m 57s
test (py39, postgresql-file)	4m 17s
test (py39, postgresql-file-sqlalchemy14)	4m 48s
test (py39, postgresql-swift)	5m 32s
test (py39, postgresql-s3)	5m 33s
test (py311, postgresql-file-upgrade-from-4.5)	4m 41s
test (py311, mysql-file)	5m 5s
test (py311, mysql-file-sqlalchemy14)	4m 48s
test (py311, mysql-swift)	5m 7s
test (py311, mysql-s3)	5m 33s
test (py311, postgresql-file)	4m 48s
test (py311, postgresql-file-sqlalchemy14)	5m 1s
test (py311, postgresql-swift)	5m 19s
test (py311, postgresql-s3)	5m 21s
test (py312, mysql-ceph-upgrade-from-4.5)	4m 22s
test (py312, postgresql-file-upgrade-from-4.5)	4m 38s
test (py312, mysql-file)	4m 57s
test (py312, mysql-file-sqlalchemy14)	4m 59s
test (py312, mysql-swift)	5m 23s
test (py312, mysql-s3)	5m 38s
test (py312, postgresql-file)	4m 33s
test (py312, postgresql-file-sqlalchemy14)	5m 4s
test (py312, postgresql-swift)	4m 51s
test (py312, postgresql-s3)	5m 4s
	2h 33m 26s

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