adding metadata file

README.md

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 # GitHub Action for Rust and MUSL
 
-Action provides an environment with stable Rust 1.37, MUSL and x86_64-unknown-linux-musl target. This is based heavily off https://github.com/emk/rust-musl-builder. 
+Action provides an environment with stable Rust, MUSL and x86_64-unknown-linux-musl target. This is based heavily off https://github.com/emk/rust-musl-builder. 
 code for the base image from which the Dockerfile derives is here: https://github.com/stevenleadbeater/rust-musl-builder-base
 The following static binaries are compiled in to the base image as per the emk/rust-musl-builder repo
 

action.yml

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+name: "Rust MUSL static binary builder for Alpine"
+description: "Build a statically linked rust binary compatible with Alpine containers"
+author: "Steven Leadbeater <[email protected]>"
+
+branding:
+  icon: "anchor"
+  color: "blue"
+
+runs:
+  using: docker
+  image: docker://ledsys/rust-musl-builder:0.0.1