New Dockerfile that generate a Debian package for Mcrypt perl module

perl-mcrypt/README.md

@@ -0,0 +1,23 @@
+# Mcrypt module
+
+This container creates Debian package for the `Mcrypt` module.
+
+
+## Usage
+
+First, build the container:
+
+```
+docker build -t mcrypt-builder .
+```
+
+Run the container then retrieve the package:
+
+```
+docker run --name mcrypt_builder mcrypt-builder
+docker cp mcrypt_builder:$(docker diff mcrypt_builder | grep -oE '[^ ]+deb$') ./
+docker rm mcrypt_builder
+```
+
+In your current directory, you will have a file named like:
+`libmcrypt-perl_2.5.7.0-1_amd64.deb`.