feat: add support for PAM authentication #106

Job	Run time
lint	36s
test (debian, latest)	2m 7s
test (debian, bullseye)	2m 24s
test (debian, buster)	1m 51s
test (enterpriselinux, 8)	1m 11s
test (enterpriselinux, latest)	1m 46s
test (fedora, 38)	2m 0s
test (fedora, 39)	2m 19s
test (fedora, latest)	2m 2s
test (opensuse, latest)	1m 20s
test (ubuntu, latest)	2m 51s
test (ubuntu, focal)	2m 30s
	22m 57s

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