Stress that this is a fork

Author: zickgraf

README.md

@@ -1,20 +1 @@
-# Docker container for external software used by GAP packages.
-
-This repository contains the dockerfile for the gap-docker-base image.
-It is build on gap-system/gap-container and contains additional software,
-used by some packages in GAP. External software at the moment is
-
-* CXSC 2-5-4
-* fplll 5.2.1
-* Singular 4.1.2p1
-* 4ti2 1.6.7
-* PARI/GP 2.9.5
-* Many Ubuntu packages providing dependencies for various GAP package, including
-  libmpc, libmpfi, libmpfr, polymake, ...
-
-# Build instructions
-
-This build requires more resources, and therefore should be performed manually. In the `gap-docker-base` directory, call:
-* `docker build --no-cache --tag="gapsystem/gap-docker-base:latest" .`
-* `docker login`
-* `docker push gapsystem/gap-docker-base:latest`
+# Fork of https://github.com/gap-system/gap-docker-base