ci: add testing under encfs #1755

Job	Run time
build-package	41s
build-package	15m 50s
test-annex	0s
test-annex-more	0s
test-annex-more	17s
test-datalad	0s
test-datalad (master)	1h 39m 22s
test-annex (normal, macos-13)	6m 46s
test-annex (crippled-tmp, macos-13)	8m 13s
test-datalad (maint)	1h 34m 28s
test-datalad (release)	1h 27m 9s
test-annex (custom-config1, macos-13)	6m 40s
test-annex (normal, macos-latest)	14m 50s
	5h 34m 16s

Provide feedback