Installs PyRDL in CI without ARC

Modifies the PyRDL installation process to allow installation within the CI environment, even when ARC is not explicitly installed.

This change ensures that PyRDL can be installed and tested in CI
without requiring a full ARC installation, streamlining the CI workflow.

Author: calvinp0

devtools/install_all.sh

@@ -97,8 +97,11 @@ else
     echo ":information_source:  CI detected or --no-arc flag set. Skip cleaning ARC installation."
 fi
 
-# 3) PyRDL (depends on ARC)
-if [[ $ARC_INSTALLED == true ]]; then
+# 3) PyRDL (needs arc_env, but not ARC install)
+if [[ "${CI:-false}" == "true" ]]; then
+    echo "=== Installing PyRDL (CI) ==="
+    bash devtools/install_pyrdl.sh
+elif [[ $ARC_INSTALLED == true ]]; then
     echo "=== Installing PyRDL ==="
     bash devtools/install_pyrdl.sh
 else