Fix release download

Author: lukehinds

Dockerfile

@@ -24,9 +24,6 @@ COPY . /app
 # Build the webapp
 FROM node:23-slim AS webbuilder
 
-# Set the release URL (this should be static and not change often)
-ARG LATEST_RELEASE=https://api.github.com/repos/stacklok/codegate-ui/releases/latest
-
 # Install curl for downloading the webapp from GH and unzip to extract it
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
@@ -36,10 +33,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 WORKDIR /usr/src/
 
-# Download the latest release of the webapp in one single RUN instruction
-RUN TAG=$(curl -s ${LATEST_RELEASE} | jq -r '.tag_name') && \
-    echo "Latest FE release: ${TAG}" && \
-    curl -s ${LATEST_RELEASE} | jq -r '.zipball_url' | xargs curl -L -o main.zip
+# Ensure the LATEST_RELEASE argument is passed or set a default value
+ARG LATEST_RELEASE="https://api.github.com/repos/stacklok/codegate-ui/releases/latest"
+RUN echo "Latest FE release: $LATEST_RELEASE" \
+    && TAG=$(curl -s $LATEST_RELEASE | jq -r '.tag_name') \
+    && echo "Latest FE release: ${TAG}" \
+    && ZIP_URL=$(curl -s $LATEST_RELEASE | jq -r '.zipball_url') \
+    && curl -L -o main.zip $ZIP_URL
 
 # Extract the downloaded zip file
 RUN unzip main.zip