Fix the magic build. Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

diff --git a/.github/Dockerfile b/.github/Dockerfile
index a641596..44334c7 100644
--- a/.github/Dockerfile
+++ b/.github/Dockerfile

@@ -13,23 +13,24 @@
 # limitations under the License.
 
 # syntax = docker/dockerfile:1.0-experimental
-FROM centos:centos6 as build
+FROM centos:centos8 as build
 
 # Common development tools and libraries (kitchen sink approach)
-RUN yum groupinstall -y "Development Tools" "Development Libraries"
-RUN yum -y install centos-release-scl && \
-    yum -y install devtoolset-8 devtoolset-8-libatomic-devel
+RUN yum groupinstall -y "Development Tools"
+# "Development Libraries"
+#RUN yum -y install centos-release-scl && \
+#    yum -y install devtoolset-8 devtoolset-8-libatomic-devel
 
 # python 3.6
-RUN yum install -y https://repo.ius.io/ius-release-el6.rpm
-RUN yum install -y python36u python36u-libs python36u-devel python36u-pip python36u-tkinter
-RUN alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 60
+#RUN yum install -y https://repo.ius.io/ius-release-el6.rpm
+#RUN yum install -y python36u python36u-libs python36u-devel python36u-pip python36u-tkinter
+#RUN alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 60
 
 # magic dependencies
 RUN yum install -y csh wget tcl-devel tk-devel libX11-devel cairo-devel ncurses-devel
 
 #General utils
-RUN yum install -y tcllib
+#RUN yum install -y tcllib
 RUN yum install -y git tcl tk libjpeg libgomp libXext libSM libXft libffi cairo gettext Xvfb
 RUN yum install -y python3 python3-pip python3-tkinter python3-devel
 
@@ -37,7 +38,7 @@
 
 WORKDIR magic_15102020
 
-RUN git checkout 4bbe4ef74e5eac98c503bf6483ee7a40dbb0547a
+#RUN git checkout 4bbe4ef74e5eac98c503bf6483ee7a40dbb0547a
 
 # build
 RUN ./configure --prefix=/build && \

diff --git a/.github/build-docker.sh b/.github/build-docker.sh
old mode 100644
new mode 100755