revert Fix file ownership issues for self-hosted runners. (#141) (#165)

action/Dockerfile

@@ -1,10 +1,6 @@
 ARG IMAGE
 FROM $IMAGE
 
-ARG UNAME=runner
-ARG UID=1000
-ARG GID=1000
-
 LABEL "com.github.actions.name"="Unity - Builder"
 LABEL "com.github.actions.description"="Build Unity projects for different platforms."
 LABEL "com.github.actions.icon"="box"
@@ -14,15 +10,9 @@ LABEL "repository"="http://github.com/webbertakken/unity-actions"
 LABEL "homepage"="http://github.com/webbertakken/unity-actions"
 LABEL "maintainer"="Webber Takken <webber@takken.io>"
 
-RUN bash -c 'mkdir -p /github/{home,workflow,workspace}' && chown $UID:$GID -R /github/
-RUN getent group $GID || groupadd -g $GID $UNAME
-RUN id -u $UID &>/dev/null || useradd -m -u $UID -g $GID -s /bin/bash -d /github/home $UNAME
-
 ADD default-build-script /UnityBuilderAction
 ADD steps /steps
 RUN chmod -R +x /steps
 ADD entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
-
-USER $UID:$GID