Specify base OS in test and pushes #286

Job	Run time
xcache:3.6-development image build	5m 46s
make-date-tag	0s
xcache:3.6-testing image build	22m 51s
xcache:23-testing image build	1m 22s
xcache:3.6-release image build	1m 51s
xcache:23-release image build	1m 25s
atlas-xcache:3.6-development image build	1m 28s
atlas-xcache:3.6-testing image build	1m 50s
atlas-xcache:23-testing image build	1m 29s
atlas-xcache:3.6-release image build	1m 6s
atlas-xcache:23-release image build	1m 8s
cms-xcache:3.6-development image build	1m 53s
cms-xcache:3.6-testing image build	1m 58s
cms-xcache:23-testing image build	1m 38s
cms-xcache:3.6-release image build	1m 20s
cms-xcache:23-release image build	1m 49s
stash-cache:3.6-development image build	1m 34s
stash-cache:3.6-testing image build	1m 33s
stash-cache:23-testing image build	1m 20s
stash-cache:3.6-release image build	1m 6s
stash-cache:23-release image build	1m 19s
stash-origin:3.6-development image build	2m 34s
stash-origin:3.6-testing image build	2m 48s
stash-origin:23-testing image build	1m 9s
stash-origin:3.6-release image build	1m 45s
stash-origin:23-release image build	1m 14s
Test Stash Cache and Origin (development, 3.6, el7)	2m 48s
Test Stash Cache and Origin (testing, 3.6, el7)	2m 59s
Test Stash Cache and Origin (testing, 23, el9)	2m 10s
Test Stash Cache and Origin (release, 3.6, el7)	2m 22s
Test Stash Cache and Origin (release, 23, el9)	2m 35s
Push ${{ matrix.image }}:${{ matrix.osg_series.name }}-${{ matrix.repo }} image	0s
	1h 18m 10s

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