Add pull request support

.github/workflows/close_pr.yml

@@ -0,0 +1,22 @@
+name: ClosePullRequestAction
+
+on: 
+  pull_request_target:
+    types: [closed]
+    branches: [ main ]
+
+jobs:
+  close:
+    runs-on: self-hosted
+    steps:
+      - name: close pull request
+        run: |
+          PR_NUMBER=$(jq -r ".pull_request.number" $GITHUB_EVENT_PATH)
+          echo "Cleaning up after $PR_NUMBER has closed"
+          BUILDDIR="/srv/websitepreview/$AWS_STATIC_SITE_URL-$PR_NUMBER"
+          if [ -d "$BUILDDIR" ]; then
+              echo "Removing website review directory"
+              rm -rf "$BUILDDIR"
+          else
+              echo "No website review directory ($BUILDDIR) to remove"
+          fi

.github/workflows/pull_request.yml

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+name: PullRequestAction
+
+on:
+  pull_request_target:
+    branches: [ main ]
+
+# Cancel in-progress jobs or runs for the current pull request
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number }}
+  cancel-in-progress: true
+
+jobs:
+  process-pull-request:
+    runs-on: self-hosted
+    steps:
+      - name: Fetch git repository
+        uses: actions/[email protected]
+        with:
+          fetch-depth: "0"
+
+      - name: Initialise status
+        run: /srv/github-action-scripts/init-deploy-preview.sh
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Merge test branch
+        uses: linaro-its/[email protected]
+
+      - name: Build site
+        run: /srv/github-action-scripts/build-astro-site.sh
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}