First jab at rebasing to the new upstream

Dockerfile

-FROM sameersbn/gitlab-ci-multi-runner:1.1.4-7
+FROM gitlab/gitlab-runner:ubuntu
 MAINTAINER Michał "rysiek" Woźniak <rysiek@occrp.org>
 
 #
@@ -44,4 +44,4 @@ RUN if [ "$INSTALL_PACKAGES" != "" ]; then \
         rm -rf /var/lib/apt/lists/* ; \
     fi
 
-VOLUME /output
+VOLUME ["/etc/gitlab-runner", "/home/gitlab-runner", "/output"]

README.md

-# Extendable Gitlab CI Multi runner
+# Extendable Gitlab CI runner
 
-A Gitlab CI runner docker with ability to install packages at buildtime. Based on the great [`gitlab-ci-multi-runner`](https://hub.docker.com/r/sameersbn/gitlab-ci-multi-runner/).
+A Gitlab CI runner docker with ability to install packages at buildtime. Based on the great [`gitlab-runner`](https://gitlab.com/gitlab-org/gitlab-runner/).
 
 ## Example `docker-compose` config
 
 ```
 gitlab-ci-runner:
     build:
-        context: https://git.occrp.org/libre/gitlab-ci-multi-runner.git
+        context: https://git.occrp.org/libre/gitlab-runner.git
         args:
             INSTALL_PACKAGES:  "rsync less"
     environment:
@@ -17,5 +17,6 @@ gitlab-ci-runner:
         RUNNER_TOKEN:         "abcdef0123456789abcdef01234567"
     volumes:
         - "/var/www/:/output/"
-        - "/var/lib/gitlab-ci-multi-runner/:/home/gitlab_ci_multi_runner/data/"
+        - "/var/lib/gitlab-runner/etc/:/etc/gitlab-runner/"
+        - "/var/lib/gitlab-runner/home/:/home/gitlab-runner/"
 ```
\ No newline at end of file