Update Dockerfile

Author: thomasleplus

xml/Dockerfile

@@ -34,7 +34,7 @@ RUN pip3 install --no-cache-dir --upgrade --break-system-packages \
     gpxpy==1.6.2 \
     tcx2gpx==0.1.5 \
     yq==3.4.3 \
-    && IFS=$'\n\t' msg="$(pip3 list --outdated | grep -i -e '^gpxpy ' -e '^tcx2gpx ' -e '^yq ' || true)" \
+    && msg="$(pip3 list --outdated | grep -i -e '^gpxpy ' -e '^tcx2gpx ' -e '^yq ' || true)" \
     && if [ -n "${msg}" ]; then \
        >&2 echo "ERROR: outdated: ${msg}" ; \
        exit 1 ; \