New `geoips list source-names` CLI command #354

Job	Run time
set_variables	2s
print_run_flags	2s
build_doclinttest_image	2m 2s
check_no_edits_to_rst_release_note	28s
lint_bandit	31s
build_sphinx_html	1m 27s
check_new_release_note	28s
lint_doc8	30s
lint_flake8	32s
lint_black	29s
test_interfaces	1m 5s
test_pytest_short	1m 15s
	8m 51s

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