Automaticcaly get GPG_KEY_ID

ci/stack_env.sh

@@ -29,6 +29,13 @@ else
     export acc_type="none"
 fi
 
+set +u
+if [ "x$GPG_KEY_ID" == "x" ]
+then
+    export GPG_KEY_ID=$(gpg --show-keys $GPG_PRIVATE_KEY 2> /dev/null | head -n 2 | tail -1)
+fi
+set -u
+
 echo "STACK_CONFIG_PATH: ${STACK_CONFIG_PATH}"
 echo "STACK_CONFIG: ${STACK_CONFIG}"
 echo "SPACK_VERSION: ${SPACK_VERSION}"