ci: fix base image string argument

Author: phsauter

.github/workflows/build-and-push.yml

@@ -105,7 +105,6 @@ jobs:
           # Read the base-image label from the source image for the current platform
           # ubuntu:noble as the fallback
           BASE=$(docker buildx imagetools inspect \
-            --raw \
             "hpretl/iic-osic-tools:${{ needs.prepare.outputs.source_tag }}" \
             --format '{{ (index .Image.Config.Labels "org.opencontainers.image.base.name") }}' \
             2>/dev/null || true)

Dockerfile

@@ -27,6 +27,7 @@
 # as they are not shared libraries and ldd cannot see them.
 
 ARG SOURCE_IMAGE=hpretl/iic-osic-tools:2025.12
+ARG BASE_IMAGE=ubuntu:noble
 FROM ${SOURCE_IMAGE} AS source
 
 # Derive the needed apt-managed packages
@@ -59,10 +60,9 @@ RUN find \
 # choose to install is pinned to exactly the version from this image.
 RUN pip3 freeze > /tmp/pip-constraints.txt
 
-# Base image: defaults to ubuntu:noble but can be overridden at build time.
+# Base image: overridden at build time via --build-arg BASE_IMAGE=...
 # In CI the base is read from the org.opencontainers.image.base.name label
 # of the source image so this image always tracks the same base as iic-osic-tools.
-ARG BASE_IMAGE=ubuntu:noble
 FROM ${BASE_IMAGE}
 
 ENV DEBIAN_FRONTEND=noninteractive \