docs: add report about SSL certificate issue on ks1

docs/reports/2024-12-23-images-certificate-expired.md

@@ -0,0 +1,19 @@
+# 2024-12-23 SSL certificate on images.openfoodfacts.org expired
+
+On the 23rd of December 2024, I (Raphaël) noticed that the SSL certificate on `images.openfoodfacts.org` had expired.
+
+I checked the certificate on the server, and it looks like certbot was not configured on the server, and that the SSL certificate was copied manually (see https://openfoodfacts.github.io/openfoodfacts-infrastructure/reports/2024-09-24-kimsufi-stor-ks1-installation/#configure).
+
+I deleted the certificate folder:
+
+```bash
+rm -rf /etc/letsencrypt/live/images.openfoodfacts.org/
+```
+
+change the nginx configuration to listen on port 80, and restarted the nginx service.
+
+I then launched certbot to generate a new certificate.
+
+```bash
+certbot -d images.openfoodfacts.org
+```