chore: skip lakefile.olean from ProofWidgets

Main.lean

@@ -56,7 +56,11 @@ unsafe def main (args : List String) : IO UInt32 := do
       let mut tasks := #[]
       for path in (← SearchPath.findAllWithExt sp "olean") do
         if let some m := (← searchModuleNameOfFileName path sp) then
-          tasks := tasks.push (m, ← IO.asTask (replayFromImports m))
+          -- It appears that `lakefile.olean`s are delivered via the lake release feature.
+          -- Pending answers about that https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/ProofWidgets.20bump.20required/near/398206560
+          -- we just skip a file that otherwise breaks Mathlib CI here:
+          unless s!"{m}" = "«._ProofWidgets»" do
+            tasks := tasks.push (m, ← IO.asTask (replayFromImports m))
       for (m, t) in tasks do
         if let .error e := t.get then
           IO.eprintln s!"lean4checker found a problem in {m}"