Add installation of 'at' package

Dockerfile

@@ -30,7 +30,7 @@ RUN yum -y --nogpg install \
     git parallel compat-libf2c-34 libgfortran \
     gdb gcc-c++ cmake3 libacl-devel perl-Test-Harness \
     rpm-build bzip2 automake autoconf libtool sudo vim \
-    centos-release-scl-rh
+    centos-release-scl-rh at
     
 # Install new EOS from created repo - the ADD command will reset the docker cache,
 # and any commands after that point will be uncached.

Dockerfile_asan

@@ -30,7 +30,7 @@ RUN yum -y --nogpg install \
     git parallel compat-libf2c-34 libgfortran \
     gdb gcc-c++ cmake3 libacl-devel perl-Test-Harness \
     rpm-build bzip2 automake autoconf libtool sudo vim \
-    centos-release-scl-rh
+    centos-release-scl-rh at
     
 # Install new EOS from created repo - the ADD command will reset the docker cache,
 # and any commands after that point will be uncached.

Dockerfile_xrd_testing

@@ -29,7 +29,7 @@ RUN yum -y --nogpg install \
     createrepo initscripts less nano \
     git parallel compat-libf2c-34 libgfortran \
     gdb gcc-c++ cmake3 libacl-devel perl-Test-Harness \
-    rpm-build bzip2 automake autoconf libtool sudo vim
+    rpm-build bzip2 automake autoconf libtool sudo vim at
 
 # Special packages, must be installed un-cached.
 RUN yum clean all; \

ubuntu_client/Dockerfile

@@ -32,7 +32,7 @@ RUN apt-get install -y build-essential git gdebi-core libcurl4 \
       #less has a foreign repo check it laterable
       nano parallel fort77 gcc gfortran-8 gdb g++ perl \
       libacl1-dev bzip2 automake autoconf libtool wget curl davix \
-      cadaver cmake createrepo cpio sqlite3 rsync
+      cadaver cmake createrepo cpio sqlite3 rsync at
 
 RUN curl -sL http://storage-ci.web.cern.ch/storage-ci/storageci.key | apt-key add - && apt-get update