d2vm: fix CentOS install

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

README.md

@@ -32,16 +32,13 @@ Working and tested:
 - [x] Ubuntu
 - [x] Debian
 - [x] Alpine
-
-Need fix:
-
-- [ ] CentOS
+- [x] CentOS
 
 Unsupported:
 
 - [ ] RHEL
 
-The program use the `/etc/os-release` file to discover the Linux distribution and install the Kernel,
+The program uses the `/etc/os-release` file to discover the Linux distribution and install the Kernel,
 if the file is missing, the build cannot succeed.
 
 Obviously, **Distroless** images are not supported. 

templates/centos.Dockerfile

@@ -7,7 +7,10 @@ RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* && \
 
 RUN yum update -y
 
-RUN yum install -y kernel systemd sudo
+RUN yum install -y kernel systemd NetworkManager e2fsprogs sudo && \
+    systemctl enable NetworkManager && \
+    systemctl unmask systemd-remount-fs.service && \
+    systemctl unmask getty.target
 
 RUN dracut --no-hostonly --regenerate-all --force && \
     cd /boot && \