feat: expose GITHUB_REF_SLUG

Dockerfile

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+# Container image that runs your code
+FROM alpine:3.10
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# GitHub Slug action
+
+This action slug and expose some github variables.
+
+`Slug` a variable will
+
+- put the variable content in lower case,
+- replace any caracter by `-` except `0-9` and `a-z`,
+- limit the string size to 63 caracter
+
+## Environement Variables
+
+### `GITHUB_REF_SLUG`
+
+Slug from `GITHUB_REF` env variables
+
+## Example usage
+
+```yaml
+uses: rlespinasse/github-slug-action@master
+```

action.yml

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+# action.yml
+name: 'GitHub Slug'
+description: 'Action to slug and expose some github variables'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

entrypoint.sh

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+#!/bin/sh -l
+
+echo ::set-env name=GITHUB_REF_SLUG::$(echo $GITHUB_REF | tr A-Z a-z | sed -r 's#refs/.*/##;s/[~\^]+//g;s/[^a-zA-Z0-9]+/-/g;s/^-+\|-+$//g' | cut -c1-63)