Run OSS Scanner image on Octane/FrankenPHP and bundle Gotenberg

Production runs as long-lived Octane workers in FrankenPHP worker mode, so state leaking between requests
(static properties, singletons, ...) is a real risk that php artisan serve cannot reproduce. Base the scanner image
on the production FrankenPHP image, add start-octane.sh (single worker, production Caddyfile) and describe this
class of issue in the threat model.

Bundle Gotenberg (Chromium only) so the PDF export tests pass offline and PDF rendering can be exercised.

.oss-scanner/start-octane.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Run the app the way production does: Laravel Octane on FrankenPHP in worker mode, with the production Caddyfile.
+# A worker boots the app once and then serves many requests, so state kept in memory (static properties, singletons,
+# changed config, ...) survives from one request to the next. With a single worker, consecutive requests always hit the
+# same worker, so such leaks between requests (e.g. between users of different organizations) reproduce reliably.
+#
+# Usage: .oss-scanner/start-octane.sh    (OCTANE_WORKERS and OCTANE_MAX_REQUESTS can be overridden)
+# Stop:  php artisan octane:stop
+# After changing PHP code, run `php artisan octane:reload`: workers keep the code they booted with.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+.oss-scanner/start-postgres.sh
+.oss-scanner/start-gotenberg.sh
+
+php artisan migrate --force
+if [ "$(PGPASSWORD=root psql -h 127.0.0.1 -U root -d laravel -tAc 'SELECT count(*) FROM users')" = "0" ]; then
+    php artisan db:seed --force
+fi
+php artisan optimize:clear >/dev/null
+
+nohup php artisan octane:frankenphp \
+    --host=127.0.0.1 \
+    --port=8000 \
+    --workers="${OCTANE_WORKERS:-1}" \
+    --max-requests="${OCTANE_MAX_REQUESTS:-10000}" \
+    --caddyfile=docker/prod/deployment/octane/FrankenPHP/Caddyfile \
+    >/tmp/octane.log 2>&1 &
+
+until curl -fs -o /dev/null http://127.0.0.1:8000/login; do
+    if ! kill -0 $! 2>/dev/null; then
+        cat /tmp/octane.log
+        exit 1
+    fi
+    sleep 0.5
+done
+echo "solidtime is running on http://127.0.0.1:8000 with Octane/FrankenPHP (log: /tmp/octane.log)"