RPM build on Jenkins fails on a more recent mock version than mock on workstation that succeeds – CentOS

I am trying to build and deploy an RPM package from Jenkins based on some spec file boilerplate from another project that was written earlier than mine. For some reasons, I am getting build errors when I try to build or release this package from within Jenkins.

+ rm -rf /builddir/build/BUILDROOT/component-prefix-blah-api-proxy-0.1.0.16-1.bbc.el7.x86_64
BUILDSTDERR: ++ dirname /builddir/build/BUILDROOT/component-prefix-blah-api-proxy-0.1.0.16-1.bbc.el7.x86_64
RPM build errors:
BUILDSTDERR: error: File not found by glob: /builddir/build/BUILDROOT/component-prefix-blah-api-proxy-0.1.0.16-1.bbc.el7.x86_64/var/www/cgi-bin/*
BUILDSTDERR:     File not found by glob: /builddir/build/BUILDROOT/component-prefix-blah-api-proxy-0.1.0.16-1.bbc.el7.x86_64/var/www/cgi-bin/*
Child return code was: 1
EXCEPTION: [Error()]
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/mockbuild/trace_decorator.py", line 96, in trace
    result = func(*args, **kw)
  File "/usr/lib/python2.7/site-packages/mockbuild/util.py", line 734, in do_with_status
    raise exception.Error("Command failed: n # %sn%s" % (command, output), child.returncode)
Error: Command failed: 
 # /usr/bin/systemd-nspawn -q -M b88888b933974fe283e8497d165b5369 -D /var/lib/mock/epel-7-x86_64-9876/root --capability=cap_ipc_lock --bind=/tmp/mock-resolv.kXeD1i:/etc/resolv.conf --setenv=LANG=en_GB.UTF-8 --setenv=TERM=vt100 --setenv=SHELL=/bin/bash --setenv=HOSTNAME=mock --setenv=PROMPT_COMMAND=printf "33]0;<mock-chroot>07" --setenv=HOME=/builddir --setenv=PATH=/usr/bin:/bin:/usr/sbin:/sbin --setenv=PS1=<mock-chroot> s-v$  -u mockbuild bash --login -c /usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/blah-api-proxy.spec

There is another error that came up earlier than the one above in the RPM build.log file that I do not think is the main error as I have seen this occur in other well-working builds before

BUILDSTDERR: Failed to create directory /var/lib/mock/epel-7-x86_64-9876/root//sys/fs/selinux: Read-only file system

I have tried setting the –old-chroot flag on the execution of mock. However, I started getting two errors –

ERROR: Exception(/var/lib/jenkins/workspace/component-prefix-blah-api-proxy/blah-api-proxy/SRPMS/component-prefix-blah-api-proxy-0.1.0.15-1.bbc.el7.src.rpm) Config(epel-7-x86_64) 0 minutes 11 seconds
and

 # bash --login -c /usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/blah-api-proxy.spec

Version: 0.1.0%{?BUILD_NUMBER:.%{BUILD_NUMBER}}
Release: 1%{?dist}
Group: System Environment/Daemons
License: Internal COY use only
Summary: BLAH API Proxy
Source0: src.tar.gz
Requires: blah-blah-ssl-services-blah-staff jq
BuildRoot: %(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
BuildArch: x86_64

%description
BLAH API Proxy

%prep
%setup -q -n src

%build

%install
mkdir -p %{buildroot}
cp -r * %{buildroot}/

%clean
rm -rf %{buildroot}

%pre

%files
%defattr(0755, root, root, 0755)
/var/www/cgi-bin/*

%defattr(-, root, root, 0755)
/etc/bake-scripts/*

%defattr(0755, root, root, 0755)
/etc/bake-scripts/blah-api-proxy

N.B: blah-api-proxy is a directory containing Apache proxy server configurations.

The src folder structure is as follows:

src/
├── etc
│   └── bake-scripts
│       ├── blah-api-proxy
│       └── public-endpoints
└── var
    └── www
        └── cgi-bin

I will be very grateful if I get help in resolving this issue.
Thank you very much in advance.