08-challenge-shellcode-after: Add Makefile and Dockerfile with multi-stage pattern

[Stefan1627]

Prerequisite Checklist

• Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Updated relevant documentation (if needed).

Description of changes

[razvand]

Use Dockerfile instead of dockerfile. What is the Dockerfile model you used?

Use proper commit messages. See:

• instructions here (part of the Git workshop content)
• history of commits in the repository

Sign your commits, use Signed-off-by: ...

[razvand]

Extend your commit message with a commit description. Mention the rationale / motivation for adding a Dockerfile.

You need two Makefiles. A Makefile.sol that will be used to build the source code. That Makefile will get copied in the Dockerfile. And a Makefile (the current one) that deploys the container.

Currently you are copying the Docker Makefile and running make inside the container. That will not work.

Use a proper name for the commit authorship and signature, i.e. use Stefan Calmac <stefancalmac@gmai.com> instead of Stefan1627 <stefancalmac@gmai.com>.

[razvand]

Extend your commit message with a commit description. Mention the rationale / motivation for adding a Dockerfile.

Add a Makefile.sol file with the rules to build the source code file. Copy that file in the container in order to build it to an executable.