Edited Dockerfile

This configuration file edit aligns Solid's SSL Certificate file naming convention.
Now using the more widely adopted "privkey.pem" for the private key file name and "fullchain.pem" for the certificate file.

Author: steven-tomlinson

Dockerfile

@@ -8,6 +8,6 @@ RUN openssl req \
     -nodes \
     -x509 \
     -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com" \
-    -keyout cert.key \
-    -out cert.pem
+    -keyout privkey.pem \
+    -out fullchain.pem
 CMD npm run solid start