alpine support added in __package_update_index

cdist/conf/type/__package_update_index/explorer/currage

@@ -34,6 +34,9 @@ case "$type" in
             echo 0
         fi
         ;;
+    alpine)
+        echo 0
+        ;;
     *)  echo "Your specified type ($type) is currently not supported." >&2
         echo "Please contribute an implementation for it if you can." >&2
         ;;

cdist/conf/type/__package_update_index/explorer/type

@@ -26,6 +26,7 @@ else
         amazon|scientific|centos|fedora|redhat) echo "yum" ;;
         debian|ubuntu|devuan) echo "apt" ;;
         archlinux) echo "pacman" ;;
+        alpine) echo "apk" ;;
         *)
             echo "Don't know how to manage packages on: $os" >&2
             exit 1

cdist/conf/type/__package_update_index/gencode-remote

@@ -47,6 +47,10 @@ case "$type" in
         echo "pacman --noprogressbar --sync --refresh"
         echo "pacman package database synced (age was: $currage)" >> "$__messages_out"
         ;;
+    alpine)
+        echo "apk update"
+        echo "apk package database updated."
+        ;;
     *)
         echo "Don't know how to manage packages for type: $type" >&2
         exit 1