check if secret is empty

Dockerfile

@@ -22,11 +22,11 @@ RUN --mount=type=secret,id=MODEL_NAME,mode=0444 \
     --mount=type=secret,id=MONGODB_URL,mode=0444 \
     --mount=type=secret,id=APP_COLOR,mode=0444 \
     --mount=type=secret,id=APP_NAME,mode=0444 \
-    MODEL_NAME=$(cat /defaults/MODEL_NAME) && echo "$MODEL_NAME" \
-    && MODEL_PARAMS=$(cat /defaults/MODEL_PARAMS) && echo "$MODEL_PARAMS" \
-    && MONGODB_URL=$(cat /defaults/MONGODB_URL) && echo "$MONGODB_URL" \
-    && APP_COLOR=$(cat /defaults/APP_COLOR) && echo "$APP_COLOR" \
-    && APP_NAME=$(cat /defaults/APP_NAME) && echo "$APP_NAME" \
+    MODEL_NAME=$(cat /run/secrets/MODEL_NAME 2> /dev/null | grep '^' || /defaults/MODEL_NAME) && echo "$MODEL_NAME" \
+    && MODEL_PARAMS=$(cat /run/secrets/MODEL_PARAMS 2> /dev/null | grep '^' || /defaults/MODEL_PARAMS) && echo "$MODEL_PARAMS" \
+    && MONGODB_URL=$(cat /run/secrets/MONGODB_URL 2> /dev/null | grep '^' || /defaults/MONGODB_URL) && echo "$MONGODB_URL" \
+    && APP_COLOR=$(cat /run/secrets/APP_COLOR 2> /dev/null | grep '^' || /defaults/APP_COLOR) && echo "$APP_COLOR" \
+    && APP_NAME=$(cat /run/secrets/APP_NAME 2> /dev/null | grep '^' || /defaults/APP_NAME) && echo "$APP_NAME" \
     && echo "vars hello" \ 
     && envsubst < ".template.env.local" > ".env.local"