Fix docker build command syntax in workflow

Author: Programeerik

.github/workflows/docker-build-frontend.yml

@@ -11,4 +11,4 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Build the Frontend Docker image
-        run:  docker build ShowcaseProject --file ShowcaseProject/ShowcaseFrontend/Dockerfile --tag my-image-name:$(date +%s) ShowcaseProject
+        run:  docker build --file ShowcaseProject/ShowcaseFrontend/Dockerfile --tag my-image-name:$(date +%s) ShowcaseProject