use absolute path for output mount

run.sh

@@ -14,8 +14,10 @@ if [ -z "${SIGNAL_DIR+x}" ]; then
     exit 1
 fi
 
+OUTDIR="$(pwd)/output"
+
 if [ $FILTER -eq 1 ]; then
-    docker run -it -v "$SIGNAL_DIR":/root/.config/Signal -v ./output:/output sigint -f config/chat_list.txt
+    docker run -it -v "$SIGNAL_DIR":/root/.config/Signal -v "$OUTDIR":/output sigint -f config/chat_list.txt
 else
-    docker run -it -v "$SIGNAL_DIR":/root/.config/Signal -v ./output:/output sigint
+    docker run -it -v "$SIGNAL_DIR":/root/.config/Signal -v "$OUTDIR":/output sigint
 fi