fix: coverage

Signed-off-by: gfanton <[email protected]>

.github/workflows/test_template.yml

@@ -36,13 +36,17 @@ jobs:
             mkdir -p "$GOCOVERDIR" "$TXTARCOVERDIR" "$COVERDIR"
 
             # Craft a filter flag based on the module path to avoid expanding coverage on unrelated tags.
-            export filter="-pkg=github.com/gnolang/gno/${{ inputs.modulepath }}/..."
+            export coverpkg="github.com/gnolang/gno/${{ inputs.modulepath }}/..."
+            export filter="-pkg=$coverpkg"
 
             # XXX: Simplify coverage of txtar - the current setup is a bit
             # confusing and meticulous. There will be some improvements in Go
             # 1.23 regarding coverage, so we can use this as a workaround until
             # then.
-            go test -covermode=atomic -timeout ${{ inputs.tests-timeout }} ./... -test.gocoverdir=$GOCOVERDIR
+            go test -coverpkg=$coverpkg \
+                    -covermode=atomic \
+                    -timeout ${{ inputs.tests-timeout }} \
+                    ./... $coverpkg -test.gocoverdir=$GOCOVERDIR
 
             # Print results
             (set +x; echo 'go coverage results:')