Fix install command

Dockerfile

@@ -23,7 +23,7 @@ USER captica
 # it needs to build it correctly.
 RUN N8N_VERSION=$(curl -s https://api.github.com/repos/n8n-io/n8n/releases/latest | jq -r '.tag_name' | sed 's/^v//') && \
     echo "Latest n8n version: ${N8N_VERSION}" && \
-    npm_config_user=root npm install -g {N8N_VERSION} && \
+    npm_config_user=root npm install -g ${N8N_VERSION} && \
     apt-get clean all