CentOS's ghost has been laid to rest

.github/workflows/docker.yml

@@ -10,7 +10,7 @@ jobs:
     container: docker://nasatrick/${{matrix.container}}:latest
     strategy:
       matrix:
-        container: [trick_centos7, trick_centos8, trick_ubuntu1804]
+        container: [trick_ubuntu1804]
     steps:
       - name: run tests
         run: |

.github/workflows/test_linux.yml

@@ -94,30 +94,6 @@ jobs:
               zlib-devel
               python2-devel
               python3-devel
-#-------- RHEL 7-based Only Dependencies ----------------
-          - cfg: { arch: rhel, arch_ver: 7 }
-            pkg_mgr: yum
-            conf_pkg: |
-              sed -i -e "s|mirrorlist=|#mirrorlist=|g" -e "s|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g" /etc/yum.repos.d/CentOS-* &&
-              yum -y install epel-release
-              yum -y update
-              yum -y install wget
-            os_deps: >-
-              libX11-devel
-              libXt-devel
-              swig3
-            install_gtest: |
-              cd /tmp
-              wget https://github.com/google/googletest/archive/release-1.8.0.tar.gz
-              tar xzvf release-1.8.0.tar.gz
-              cd /tmp/googletest-release-1.8.0/googletest
-              cmake .
-              make
-              make install
-              cd /tmp/googletest-release-1.8.0/googlemock
-              cmake .
-              make
-              make install
 #-------- RHEL 8-based Only Dependencies ----------------
           - cfg: { arch: rhel, arch_ver: 8 }
             pkg_mgr: dnf