adds app-entrypoint.sh to initialize ruby module at launch

bitnami/ruby/rootfs/app-entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/bash -e
+
+function initialize {
+    # Package can be "installed" or "unpacked"
+    status=`nami inspect $1`
+    if [[ "$status" == *'"lifecycle": "unpacked"'* ]]; then
+        inputs=""
+        if [[ -f /$1-inputs.json ]]; then
+            inputs=--inputs-file=/$1-inputs.json
+        fi
+        nami initialize $1 $inputs
+    fi
+}
+
+for module in ruby; do
+  initialize $module
+done
+
+exec /entrypoint.sh "$@"