fix: evaluate http response code for package existence

.gitea/workflows/poll-upstream.yml

@@ -25,10 +25,20 @@ jobs:
           # Query our own dnf repo. If the version is there, we've already built it.
           # Strip leading 'v' because RPM versions don't use it.
           version="${UPSTREAM_TAG#v}"
-          if curl --fail --silent --show-error --head --url "https://rpm.lair.cafe/fedora/43/x86_64/mistralrs-server-cuda13-${version}-1.fc43.x86_64.rpm" | grep -q '^HTTP.*200'; then
+          http_response_code=$(curl \
+              --fail \
+              --silent \
+              --write-out "%{http_code}" \
+              --output /dev/null \
+              --head \
+              --url "https://rpm.lair.cafe/fedora/43/x86_64/mistralrs-server-cuda13-${version}-1.fc43.x86_64.rpm")
+          if [ "${http_response_code}" = "200" ]; then
             echo "already_built=true" >> "$GITHUB_OUTPUT"
-          else
+          elif [ "${http_response_code}" = "404" ]; then
             echo "already_built=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "Unexpected HTTP response code: ${http_response_code}"
+            exit 1
           fi
         env:
           UPSTREAM_TAG: ${{ steps.upstream.outputs.tag }}