Add url variables

build-docker-images/wazuh-dashboard/Dockerfile

@@ -5,12 +5,15 @@ ARG WAZUH_VERSION
 ARG WAZUH_TAG_REVISION
 ARG WAZUH_UI_REVISION
 ARG INSTALL_DIR=/usr/share/wazuh-dashboard
+ARG TARGETARCH
 ARG wazuh_dashboard_url_amd64_rpm
 ARG wazuh_dashboard_url_arm64_rpm
 
 # Update and install dependencies
-RUN dnf install curl-minimal libcap openssl -y && \
-    curl -o /wazuh-dashboard.rpm "${wazuh_dashboard_url_$TARGETARCH_rpm}" && \
+RUN URL_VAR="wazuh_dashboard_url_${TARGETARCH}_rpm" && \
+    dashboard_url="${!URL_VAR}" && \
+    dnf install curl-minimal libcap openssl -y && \
+    curl -o /wazuh-dashboard.rpm "${dashboard_url}" && \
     dnf install /wazuh-dashboard.rpm -y && \
     dnf clean all