Add GitHub Action support

action.yaml

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+---
+name: "Community Home Assistant Add-ons Repository Updater"
+description: Tool for updating Home Assistant Add-on repositories.
+author: frenck
+
+branding:
+  color: red
+  icon: thumbs-up
+
+inputs:
+  token:
+    description: GitHub token that is allowed to write/commit to the target repo
+    required: true
+  repository:
+    description: The add-on repository to update (e.g., frenck/repository)
+    required: false
+  addon:
+    description: Slug of the add-on to update the repository for
+    required: false
+  force:
+    description: Force repository update, even if no changes are detected
+    default: "false"
+    required: false
+
+runs:
+  using: "docker"
+  image: "action/Dockerfile"

action/Dockerfile

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+FROM python:3.9-alpine
+
+RUN \
+    apk add --no-cache \
+        git=2.26.2-r0 \
+    \
+    && pip3 install \
+        repository-updater==0.6.0
+
+COPY lint.py /lint.py
+
+ENTRYPOINT ["python3", "/lint.py"]

action/entrypoint.sh

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+#!/usr/bin/env bash
+declare -a options
+
+options+=(--token "${INPUT_TOKEN:-}")
+
+if [[ -n "${INPUT_ADDON:-}" ]]; then
+  options+=(--repository "${INPUT_ADDON}")
+else
+  options+=(--repository "${GITHUB_REPOSITORY}")
+fi
+
+[[ -n "${INPUT_ADDON:-}" ]] \
+  && options+=(--addon "${INPUT_ADDON}")
+
+[[ "${INPUT_FORCE,,}" = "true" ]] \
+  && options+=(--force)
+
+# Output version
+repository-updater --version
+
+# Update!
+exec repository-updater "${options[@]}"