Added cache for vcpkg and fixed CI...

.gitlab-ci.yml

@@ -6,6 +6,9 @@ stages:
 
 build_backend:
     stage: build
+    cache:
+        paths:
+            - /root/.cache/vcpkg
     script:
         - apt-get update
         - apt-get install g++ gcc make cmake git curl zip unzip tar python3 pkg-config -y
@@ -20,7 +23,7 @@ build_backend:
         - cp build/backend server
     artifacts:
         paths:
-            - backend
+            - server
         expire_in: 1h
 
 test_and_build_frontend:
@@ -42,7 +45,6 @@ test_and_build_frontend:
 
 package_server:
     stage: package
-    cache: []
     before_script: []
     needs:
         - job: build_backend