Add docker test images for CentOS 7 and 8

Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>

.travis.yml

@@ -6,6 +6,14 @@ matrix:
       os: linux
       env: CONTAINER=gentoo
       services: docker
+    - name: "Centos 7"
+      os: linux
+      env: CONTAINER=centos7
+      services: docker
+    - name: "Centos 8"
+      os: linux
+      env: CONTAINER=centos8
+      services: docker
     - name: "Fedora 28"
       os: linux
       env: CONTAINER=fedora28

docker-compose.yml

@@ -16,6 +16,22 @@ services:
     security_opt:
       - label=type:container_runtime_t
     tty: true
+  test-centos7:
+    build:
+      context: .
+      dockerfile: test/docker/centos7
+    network_mode: "host"
+    security_opt:
+      - label=type:container_runtime_t
+    tty: true
+  test-centos8:
+    build:
+      context: .
+      dockerfile: test/docker/centos8
+    network_mode: "host"
+    security_opt:
+      - label=type:container_runtime_t
+    tty: true
   test-ubuntu1604:
     build:
         context: .

test/docker/centos8

@@ -1,22 +1,19 @@
 FROM centos:8
 
 RUN yum update -y
-RUN yum install -y epel-release centos-release-scl
 RUN yum install -y \
         cmake3 \
-        devtoolset-7-gcc* \
         gcc-c++ \
         git \
         make \
         man \
         python36 \
-        python36-dateutil
+        python3-dateutil
 
 # Setup environment
 RUN echo "#!/bin/bash" >> /etc/profile.d/enable_env.sh ; \
     echo "source scl_source enable devtoolset-7" >> /etc/profile.d/enable_env.sh ;
 
-RUN ln -s /usr/bin/cmake3 /usr/bin/cmake
 RUN ln -sf /usr/bin/python3 /usr/bin/python
 
 ENV LC_ALL en_US.UTF-8