fix: avoid pipefail/SIGPIPE by using temp files for HTTP tests

tests/test.sh

@@ -58,10 +58,16 @@ done
 
 echo ""
 echo "Test: GET /"
-RESPONSE=$(curl -sf -D - "$BASE_URL/")
-STATUS=$(echo "$RESPONSE" | head -1 | grep -oP '\d{3}')
-CONTENT_TYPE=$(echo "$RESPONSE" | grep -i 'content-type' | tr -d '\r' | cut -d: -f2- | xargs)
-BODY=$(echo "$RESPONSE" | sed -n '/^\r$/,$p' | tail -n +2)
+TMPDIR=$(mktemp -d)
+cleanup() {
+  docker rm -f "$CONTAINER_NAME" >/dev/null 2>&1 || true
+  rm -rf "$TMPDIR"
+}
+curl -sf -o "$TMPDIR/body" -D "$TMPDIR/headers" "$BASE_URL/"
+STATUS=$(head -1 "$TMPDIR/headers" | grep -oP '\d{3}')
+CONTENT_TYPE=$(grep -i 'content-type' "$TMPDIR/headers" | tr -d '\r' | cut -d: -f2- | xargs)
+BODY=$(cat "$TMPDIR/body")
+trap cleanup EXIT
 
 assert "HTTP status is 200" "200" "$STATUS"
 assert_match "Content-Type is text/html" "text/html" "$CONTENT_TYPE"