add appstream validator action

appstream-validator/Dockerfile

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+FROM debian:stable-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y appstream-util
+
+# create and use an elementary user instead of root
+RUN groupadd -r elementary && useradd --no-log-init -r -g elementary elementary
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

appstream-validator/README.md

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+# Appstream Validator Action
+
+This action runs appstream-util to validate/verify the contents of a project's appdata file.
+
+## Requirements
+
+This image is intended for use with elementary debian projects. There are a few requirements before getting started:
+
+  1. The project needs an `appdata.xml` file in the `data` directory of the project. Docs: [appdata](https://elementary.io/docs/code/getting-started#appdata)
+
+## Example
+
+```yaml
+jobs:
+  validate-appstream-data:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: elementary/actions/appstream-validator@master
+```

appstream-validator/action.yml

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+name: 'Validate Appstream Data'
+description: 'Validate appstream data'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: 'git-pull-request'
+  color: 'green'

appstream-validator/entrypoint.sh

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+#!/bin/bash
+set -e
+
+# Validate Appdata
+appstream-util validate-relax --nonet "$(find data -name "*appdata*")"