ci: clean netlify when PR get closed or merged

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

.github/actions/netlify-clean/Dockerfile

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+FROM node:lts-alpine
+
+RUN apk add --no-cache jq
+RUN npm i -g netlify-cli
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT [ "/entrypoint.sh" ]

.github/actions/netlify-clean/action.yml

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+name: netlify action
+description: handle the integration with netlify
+inputs:
+  netlify_token:
+    description: Access token for netlify
+    required: true
+  site_name:
+    description: Site name on netlify
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.netlify_token }}
+    - ${{ inputs.site_name }}

.github/actions/netlify-clean/entrypoint.sh

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+#!/bin/sh
+
+set -xe
+
+function usage() {
+  echo "Usage: <netlify_auth_token> <site_name>"
+  exit 1
+}
+
+function slug() {
+  echo $1 | sed -E s/[^a-zA-Z0-9]+/-/g | sed -E s/^-+\|-+$//g | tr A-Z a-z
+}
+
+function get_site_id() {
+  netlify sites:list --json | jq --raw-output ".[] | select(.name==\"$1\") | .id"
+}
+
+if [ -z "$1" ] || [ -z "$2" ]; then
+  usage
+fi
+
+export NETLIFY_AUTH_TOKEN=$1
+site_name=$2
+
+
+echo "searching site ${site_name}"
+
+clean_site_name=$(slug $site_name)
+site_id=$(get_site_id $clean_site_name)
+
+echo "deleting site"
+
+netlify sites:delete --force "${site_id}"

.github/workflows/clean-pr.yml

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+name: remove published site from netlify
+
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  remove-site-from-netlify:
+    name: build
+    runs-on: ubuntu-latest
+    if: github.repository == 'docker/docker.github.io'
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - name: delete from netlify
+        uses: ./.github/actions/netlify-clean
+        with:
+          netlify_token: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          site_name: "${{ github.repository }}/${{ github.head_ref }}"