[8.0] feat: SingularityCE: looking for the platform-aware image in CVMFS lo… #12005

Job	Run time
pre-commit	1m 4s
check (pytest --runslow -k 'not test_BaseType_Unicode and not test_nestedStructure')	13m 28s
check (pylint -j 0 -E src/)	2m 58s
check (mypy)	2m 1s
check-py39 (pytest --runslow -k 'not test_BaseType_Unicode and not test_nestedStructure')	13m 47s
check-py39 (pylint -j 0 -E src/)	3m 7s
pycodestyle	5s
shellcheck	6s
Pylint for Python 2.7 in Pilot files	35s
	37m 11s

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