add comprehensive documentation (#9537)

docs/misc/alpine-install.func/ALPINE_INSTALL_FUNC_FUNCTIONS_REFERENCE.md

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+# alpine-install.func Functions Reference
+
+Alpine Linux-specific installation functions (apk-based, OpenRC).
+
+## Core Functions
+
+### setting_up_container()
+Initialize Alpine container setup.
+
+### update_os()
+Update Alpine packages via `apk update && apk upgrade`.
+
+### verb_ip6()
+Enable IPv6 on Alpine with persistent configuration.
+
+### network_check()
+Verify network connectivity in Alpine.
+
+### motd_ssh()
+Configure SSH daemon and MOTD on Alpine.
+
+### customize()
+Apply Alpine-specific customizations.
+
+### cleanup_lxc()
+Final cleanup (Alpine-specific).
+
+---
+
+**Last Updated**: December 2025