Refactor ZNC entrypoint to be more extensible and use HTTPS

library/znc

@@ -1,10 +1,9 @@
 Maintainers: Alexey Sokolov <[email protected]> (@DarthGandalf)
 GitRepo: https://github.com/znc/znc-docker.git
+GitCommit: 1972496841963b8c087375833e2b5c8b5cae302a
 
 Tags: 1.6.5, 1.6, latest
-GitCommit: 3a25a4a6ac50b4d969449696708aae2a2d8aeb22
 Directory: full
 
 Tags: 1.6.5-slim, 1.6-slim, slim
-GitCommit: 3a25a4a6ac50b4d969449696708aae2a2d8aeb22
 Directory: slim