add comprehensive documentation (#9537)

docs/misc/alpine-tools.func/ALPINE_TOOLS_FUNC_FUNCTIONS_REFERENCE.md

@@ -0,0 +1,31 @@
+# alpine-tools.func Functions Reference
+
+Alpine-specific tool installation functions.
+
+## Core Functions
+
+### apk_update()
+Update Alpine package lists.
+
+### apk_add(PACKAGES)
+Install Alpine packages.
+
+### apk_del(PACKAGES)
+Remove Alpine packages.
+
+### add_community_repo()
+Enable Alpine community repository.
+
+### add_testing_repo()
+Enable Alpine testing repository.
+
+### Alpine Tool Functions
+- `setup_nodejs()` - Alpine Node.js
+- `setup_php()` - Alpine PHP
+- `setup_mariadb()` - Alpine MariaDB
+- `setup_postgresql()` - Alpine PostgreSQL
+- (+ more Alpine-specific setups)
+
+---
+
+**Last Updated**: December 2025