diff --git a/.woodpecker.yaml b/.woodpecker.yaml
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+steps:
+  - name: HTML syntax check
+    image: debian:12
+    # Debian has tidy 5.6.0, which complains about the "loading" tag in img.
+    # We need a more recent version for now.
+    commands:
+      - DEBIAN_FRONTEND=noninteractive apt update -qq
+      - DEBIAN_FRONTEND=noninteractive apt install -qq -y wget
+      - wget -q https://github.com/htacg/tidy-html5/releases/download/5.8.0/tidy-5.8.0-Linux-64bit.deb
+      - echo "59e594312207234f5a17455683c13c6bc47a89cb7bf994d493acfffb591d9830 tidy-5.8.0-Linux-64bit.deb" | sha256sum -c
+      - DEBIAN_FRONTEND=noninteractive apt install -qq -y ./tidy-5.8.0-Linux-64bit.deb
+      - tidy -q -e static/index.html
+
+  - name: upload (preprod)
+    when:
+      event: [push, pull_request]
+      branch: pre-prod
+    image: plugins/s3
+    settings:
+      bucket: preprod-site
+      endpoint: https://garage.deuxfleurs.fr
+      region: garage
+      access_key:
+        from_secret: aws_access_key_id
+      secret_key:
+        from_secret: aws_secret_access_key
+      source: ./
+      target: /
+      path_style: true