A collection of helper scripts to assist in using Docker in development and production

A builder for PSSH boxes used in content encryption, as per the specification at https://w3c.github.io/encrypted-media/format-registry/initdata/cenc.html.

In ruby we use `# =>` as a comment marker that mean the immediately adjacent expression's expected value. There are gems like xmpfilter / seening_is_believing, which are to generate such comments. They are very useful. But so far we lack feature that does vice-versa; to check if the comment is actually the output of the expression. This is the library that does it.