Use Terraform Dependecy Lock in system tests (#700)

Author: endorama

internal/install/_static/terraform_deployer_run.sh

@@ -4,7 +4,9 @@ set -euxo pipefail
 
 # Terraform code may rely on content from other files than .tf files (es json, zip, html, text), so we copy all the content over
 # See more: https://github.com/elastic/elastic-package/pull/603
-cp -r /stage/* /workspace
+# NOTE: must copy hidden files too (supported by "/.")
+# See more: https://github.com/elastic/package-spec/issues/269
+cp -r /stage/. /workspace
 
 cleanup() {
   r=$?