call ldconfig as otherwise libwebp7 will not be found by hugo

Dockerfile.debian-bookworm-hugo

@@ -4,5 +4,6 @@ ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get -qq update && \
     apt-get -qq dist-upgrade && \
-    apt-get -qq install hugo libwebp-dev && \
-    apt-get -qq clean
+    apt-get -qq install hugo && \
+    apt-get -qq clean && \
+    ldconfig
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