added apk and setup-apkcache

sheets/apk

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+# apk is the tool used to install, upgrade, or delete software on a running sytem
+# of Alpine Linux package management
+
+# Install a package
+apk add $package
+
+# Remove a package
+apk del $package
+
+# Update repos
+apk update
+
+# Upgrade all packages
+apk upgrade
+
+# Find a package
+apk search $package
+
+# To list all installed packages, use:
+apk info
+
+# To determine which package a file belongs to:
+apk info --who-owns /sbin/lbu

sheets/setup-apkcache

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+# apk is the tool used to install, upgrade, or delete software on a running sytem
+# of Alpine Linux package management
+
+# To enable local APK cache run
+setup-apkcache
+
+# If you've installed Alpine to your hard drive (as 'sys'),
+# then create a cache dir and then an /etc/apk/cache symlink pointing to that dir:
+mkdir -p /var/cache/apk
+ln -s /var/cache/apk /etc/apk/cache