Add libpcre3 to Docker image

docker/Dockerfile

@@ -20,6 +20,7 @@ RUN apt-get update \
     libsm6 \
     liblzma5 \
     libzstd1 \
+    libpcre3 \
   && rm -rf /var/lib/apt/lists/*
 
 COPY --from=0 /usr/local/bin/imgproxy /usr/local/bin/