aws-sts: add page (#8669)

pages/common/aws-sts.md

@@ -0,0 +1,12 @@
+# aws sts
+
+> Security Token Service (STS) allows to request temporary credentials for (IAM) users or federated users.
+> More information: <https://docs.aws.amazon.com/cli/latest/reference/sts/>.
+
+- Get temporary security credentials to access specific AWS resources:
+
+`aws sts assume-role --role-arn {{aws_role_arn}}`
+
+- Get an IAM user or role whose credentials are used to call the operation:
+
+`aws sts get-caller-identity`