From 1faeb60e3c33b8c67e2814d64baa8b5ade97cf05 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Wed, 15 Apr 2026 17:13:00 -0500
Subject: [PATCH] Add cdo to runtime image for NARR GRIB1 decoding

NARR is GRIB1 and wgrib2 doesn't decode GRIB1 messages
(rd_grib2_seq_msg, grib1 message ignored, use wgrib). cdo handles
GRIB1 + the Lambert conformal projection + nearest-neighbor remap
that NARR's Grid 221 needs. Pulls in libnetcdf/libhdf5/libudunits2
transitively, ~30-60 MB image growth.
---
 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 1d67e1f8..cc476309 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -137,7 +137,7 @@ FROM ${RUNNER_IMAGE} AS final
 RUN apt-get update \
   && apt-get install -y --no-install-recommends \
      libstdc++6 openssl libncurses6 locales ca-certificates snmp \
-     libgfortran5 libaec0 zlib1g libpng16-16t64 libopenjp2-7 \
+     libgfortran5 libaec0 zlib1g libpng16-16t64 libopenjp2-7 cdo \
   && rm -rf /var/lib/apt/lists/*
 
 RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen