open-source-silicon.dev

<https://github.com/The-OpenROAD-Project/OpenLane/issues/660|#660 Expired certificate from klayout.org>
New issue created by <https://github.com/oharboe|oharboe>
*Description*

```
$ cd docker_build
Step 5/9 : RUN wget <https://www.klayout.org/downloads/CentOS_7/klayout-0.27.3-0.x86_64.rpm>
 ---&gt; Running in 056b38d72b4e
--2021-10-21 13:08:53--  <https://www.klayout.org/downloads/CentOS_7/klayout-0.27.3-0.x86_64.rpm>
Resolving <http://www.klayout.org|www.klayout.org> (<http://www.klayout.org|www.klayout.org>)... 178.77.102.107
Connecting to <http://www.klayout.org|www.klayout.org> (<http://www.klayout.org|www.klayout.org>)|178.77.102.107|:443... connected.
ERROR: cannot verify <http://www.klayout.org|www.klayout.org>'s certificate, issued by '/C=US/O=Let\'s Encrypt/CN=R3':
  Issued certificate has expired.
To connect to <http://www.klayout.org|www.klayout.org> insecurely, use `--no-check-certificate'.
```
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>