Ensure atomic write to the output file

.local/bin/get-nasa-apod

@@ -21,11 +21,13 @@ extension="${picture_url##*.}"
 filename="${picture_date}.${extension}"
 outfile="${WALLPAPERS}/${filename}"
 
+tempfile="$(mktemp)"
 curl \
     --location \
-    --output "${outfile}" \
+    --output "${tempfile}" \
     --silent \
     "${picture_url}"
+mv "${tempfile}" "${outfile}"
 ln \
     --force \
     --symbolic \