Fix CI configuration parsing issue

.gitlab-ci.yml

@@ -140,7 +140,7 @@ test-public:
     - ./ffsend upload test.txt -d2 -I
     - ./ffsend download $(./ffsend history -q) -I -o=download.txt
     - ./ffsend delete $(./ffsend history -q) -I
-    - cmp --silent ./test.txt ./download.txt || (echo ERROR: Downloaded file is different than original; exit 1)
+    - "cmp --silent ./test.txt ./download.txt || (echo ERROR: Downloaded file is different than original; exit 1)"
     - rm ./download.txt
 
 # Cargo crate release