Remove CI image build hacks #878

Job	Run time
check (build)	2m 28s
doc (docs)	3m 44s
check (pep8)	2m 18s
test (py39, postgresql-file-upgrade-from-4.5)	1s
doc (docs-gnocchi-web)	3m 26s
test (py39, mysql-file)	1s
test (py39, mysql-file-sqlalchemy14)	1s
test (py39, mysql-swift)	1s
test (py39, mysql-s3)	1s
test (py39, postgresql-file)	1s
test (py39, postgresql-file-sqlalchemy14)	1s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	1s
test (py311, postgresql-file-upgrade-from-4.5)	2m 21s
test (py311, mysql-file)	2m 36s
test (py311, mysql-file-sqlalchemy14)	2m 38s
test (py311, mysql-swift)	2m 36s
test (py311, mysql-s3)	2m 25s
test (py311, postgresql-file)	2m 37s
test (py311, postgresql-file-sqlalchemy14)	2m 37s
test (py311, postgresql-swift)	2m 36s
test (py311, postgresql-s3)	2m 37s
test (py312, mysql-ceph-upgrade-from-4.5)	2m 37s
test (py312, postgresql-file-upgrade-from-4.5)	1s
test (py312, mysql-file)	2m 36s
test (py312, mysql-file-sqlalchemy14)	2m 36s
test (py312, mysql-swift)	2m 25s
test (py312, mysql-s3)	2m 35s
test (py312, postgresql-file)	2m 35s
test (py312, postgresql-file-sqlalchemy14)	2m 35s
test (py312, postgresql-swift)	1s
test (py312, postgresql-s3)	1s
	53m 10s

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