set PDK and STD_CELL_LIBRARY vars in config.tcl and config.json for user_proj_example and user_project_wrapper
diff --git a/openlane/user_proj_example/config.tcl b/openlane/user_proj_example/config.tcl
index 2aa188c..94af8ba 100755
--- a/openlane/user_proj_example/config.tcl
+++ b/openlane/user_proj_example/config.tcl
@@ -13,6 +13,9 @@
# limitations under the License.
# SPDX-License-Identifier: Apache-2.0
+set ::env(PDK) "sky130A"
+set ::env(STD_CELL_LIBRARY) "sky130_fd_sc_hd"
+
set script_dir [file dirname [file normalize [info script]]]
set ::env(DESIGN_NAME) user_proj_example
