update for

API/Dockerfile

@@ -15,8 +15,15 @@ WORKDIR /app
 ENV ASPNETCORE_ENVIRONMENT=Production \
     ASPNETCORE_HTTP_PORTS=8080
 # curl: used by the HEALTHCHECK (not present in the base image)
+# libfontconfig1 + fonts: required by DevExpress.Drawing's Skia backend for PDF text
+# rendering. fonts-noto-cjk supplies the Chinese glyphs used in the receipt PDF.
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends curl \
+    && apt-get install -y --no-install-recommends \
+        curl \
+        libfontconfig1 \
+        fontconfig \
+        fonts-dejavu \
+        fonts-noto-cjk \
     && rm -rf /var/lib/apt/lists/*
 COPY --from=build /app/publish .
 # storage dir created + owned for the non-root app user