Auto-install build and fix license location error

[antihax]

I ran this docker container recently and ran into a few issues.
First the license file is not sent to the correct location.
Having to install the SAP system each time a new container is spawned is also tedious so I have forced the hostname during install which appeared to be the only issue from doing the install during build.

This PR should resolve the two issues.

[AndreaBorgia-Abo]

@antihax just tried your Dockerfile and I get this error:
Step 5/12 : COPY sapdownloads/SYBASE_ASE_TD.lic /tmp/sapdownloads/server/TAR/x86_64
COPY failed: stat /var/lib/docker/tmp/docker-builder527374911/sapdownloads/SYBASE_ASE_TD.lic: no such file or directory

[antihax]

You will need to get the demo license from SAP. Unfortunately I do not recall where this was, but it was behind a logon screen and you will need an account with them.

The license that was with the download package had expired.

[AndreaBorgia-Abo]

The license that was with the download package had expired.

I don't believe this is the case:
00:0000:00000:00000:2020/11/09 16:12:00.91 kernel SySAM: Using licenses from: /sybase/NPL/SYSAM-2_0/licenses/SYBASE_ASE_TestDrive.lic
00:0000:00000:00000:2020/11/09 16:12:00.97 kernel SySAM: Checked out license for 4 ASE_CORE (2021.0331/31-mar-2021/1A92 9318 1818 AAFA) will expire Thu 01 Apr 2021 12:00:00 AM UTC.

Anyhow, your PR looks ok now that I know what you were trying to do, I have posted in the SAP community for help.
Thanks.