Fix release download

[lukehinds]

Tested as below:

=> [webbuilder  5/11] RUN curl -s https://api.github.com/repos/stacklok/codegate-ui/releases/latest | jq -r '.zipball_url' | xargs curl -L -o main.zip     1.0s
 => CACHED [builder 2/7] RUN apt-get update && apt-get install -y --no-install-recommends     gcc     g++     && rm -rf /var/lib/apt/lists/*                0.0s
 => CACHED [builder 3/7] RUN pip install poetry==1.8.4 && rm -rf /root/.cache/pip                                                                           0.0s
 => CACHED [builder 4/7] WORKDIR /app                                                                                                                       0.0s
 => CACHED [builder 5/7] COPY pyproject.toml poetry.lock* /app/                                                                                             0.0s
 => CACHED [builder 6/7] RUN poetry config virtualenvs.create false &&     poetry install --no-dev                                                          0.0s
 => [builder 7/7] COPY . /app                                                                                                                               3.3s
 => [webbuilder  6/11] RUN unzip main.zip                                                                                                                   0.4s
 => [webbuilder  7/11] RUN rm main.zip                                                                                                                      0.2s 
 => [webbuilder  8/11] RUN mv *codegate-ui* webapp                                                                                                          0.4s 
 => [webbuilder  9/11] WORKDIR /usr/src/webapp                                                                                                              0.0s 
 => [webbuilder 10/11] RUN npm install                                                                                                                      5.8s 
 => CACHED [runtime  2/12] RUN apt-get update && apt-get install -y --no-install-recommends     libgomp1     nginx     && rm -rf /var/lib/apt/lists/*       0.0s 
 => CACHED [runtime  3/12] RUN useradd -m -u 1000 -r codegate                                                                                               0.0s 
 => CACHED [runtime  4/12] RUN chown -R codegate /var/lib/nginx &&     chown -R codegate /var/log/nginx &&     chown -R codegate /run                       0.0s
 => CACHED [runtime  5/12] COPY nginx.conf /etc/nginx/conf.d/default.conf                                                                                   0.0s
 => CACHED [runtime  6/12] WORKDIR /app                                                                                                                     0.0s
 => CACHED [runtime  7/12] COPY --from=builder /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages                              0.0s
 => [runtime  8/12] COPY --from=builder /app /app                                                                                                           1.9s
 => [webbuilder 11/11] RUN npm run build                                                                                                                    6.8s
 => [runtime  9/12] COPY --from=webbuilder /usr/src/webapp/dist /var/www/html                                                                               0.0s
 => [runtime 10/12] RUN mkdir -p /app/default_models && cp /app/codegate_volume/models/* /app/default_models/                                               0.2s
 => [runtime 11/12] RUN mkdir -p /app/codegate_volume/db                                                                                                    0.1s
 => [runtime 12/12] RUN chown -R codegate /app/codegate_volume                                                                                              0.3s
 => exporting to image                                                                                                                                      1.2s
 => => exporting layers                                                                                                                                     1.2s
 => => writing image sha256:90c843e4390c8f0aa96fd7652f2cb19fe9f8dea6194597c0d9904501349852b4                                                                0.0s
 => => naming to docker.io/stacklok/codegate-cg