fix: set "build' when building ltar

Author: tydeu

src/lake/Lake/Build/Module.lean

@@ -871,6 +871,7 @@ def Module.recBuildLtar (self : Module) : FetchM (Job FilePath) := do
         modify ({· with wantsRebuild := true})
         error "archive does not exist and needs to be built"
       else
+        updateAction .build
         self.packLtar arts
     newTrace s!"{self.name.toString}:ltar"
     addTrace art.trace

tests/lake/tests/ltar/test.sh

@@ -19,7 +19,7 @@ test_err "archive does not exist and needs to be built" \
   build +Test:ltar --no-build -v
 
 # Test the build of the `ltar` facet
-test_run build +Test:ltar -v
+test_out "Built Test:ltar" build +Test:ltar -v
 test_exp -f .lake/build/ir/Test.ltar
 
 # Test that Lake unpacks the archive if the module's artifacts are missing