pasar stdin al comando que se ejecuta

Squashed commit of the following:

commit 415163092768b8ba3690a8d9d68615f9d764da64
Author: void <v@sutty.nl>
Date:   Sun May 16 16:44:01 2021 +0000

    pasar stdin al comando que se ejecuta

    fixes #5

haini.sh

@@ -53,6 +53,7 @@ correr() {
     --dev-bind /tmp /tmp \
     --chdir "/Sutty/${PWD##*/}" \
     /bin/sh -l -c "$1"
+    /bin/sh -l -c "$1" < "${stdin:-/dev/null}"
 }
 
 crear_entorno() {
@@ -96,4 +97,4 @@ crear_entorno() {
 }
 
 crear_entorno
-correr "${1:-sh}"
+stdin=/dev/stdin correr "${1:-sh}"