fix: read gzipped builder-live.log when dumping chroot logs

copr-cli download-build fetches builder-live.log.gz (the on-mirror form
for completed builds), but the dump loop looked for plain builder-live.log
and silently emitted nothing. Try .gz first with zcat, fall back to plain,
and note the absence explicitly if neither is present.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/copr-build.sh

@@ -47,17 +47,22 @@ copr-cli download-build --dest "$LOG_DIR" "$BUILD_ID" || {
   echo "warning: failed to download build artifacts" >&2
 }
 
-# Dump each chroot's builder-live.log as a collapsible group.
+# Dump each chroot's builder-live.log as a collapsible group. COPR stores
+# the log gzipped on the mirror once the build has finished; fall back to
+# the plain file in case a backend version ever serves it uncompressed.
 for chroot_dir in "$LOG_DIR"/*/; do
   [ -d "$chroot_dir" ] || continue
   chroot=$(basename "$chroot_dir")
-  log="${chroot_dir}builder-live.log"
-  if [ -f "$log" ]; then
-    echo
-    echo "::group::${chroot} builder-live.log"
-    cat "$log"
-    echo "::endgroup::"
+  echo
+  echo "::group::${chroot} builder-live.log"
+  if [ -f "${chroot_dir}builder-live.log.gz" ]; then
+    zcat "${chroot_dir}builder-live.log.gz"
+  elif [ -f "${chroot_dir}builder-live.log" ]; then
+    cat "${chroot_dir}builder-live.log"
+  else
+    echo "(no builder-live.log found for ${chroot})"
   fi
+  echo "::endgroup::"
 done
 
 exit "$STATUS"