Replace deprecated `ENV key value` and `LABEL key value` syntax #398

Job	Run time
xcache:23-development image build	3m 28s
xcache:23-testing image build	6m 10s
xcache:23-release image build	4m 57s
make-date-tag	0s
atlas-xcache:23-development image build	49s
atlas-xcache:23-testing image build	1m 5s
atlas-xcache:23-release image build	56s
cms-xcache:23-development image build	3m 8s
cms-xcache:23-testing image build	3m 38s
cms-xcache:23-release image build	3m 14s
stash-cache:23-development image build	3m 8s
stash-cache:23-testing image build	4m 10s
stash-cache:23-release image build	3m 20s
stash-origin:23-development image build	3m 8s
stash-origin:23-testing image build	4m 15s
stash-origin:23-release image build	3m 54s
Test Stash Cache and Origin	0s
Push ${{ matrix.image }}:${{ matrix.osg_series.name }}-${{ matrix.repo }} image	0s
	49m 20s

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