CodeBuildでcentos7へiusのリポジトリ追加ができない

Dockerコンテナにて、
Centos7にpip3.6をインストールすべく
yum install -y https://centos7.iuscommunity.org/ius-release.rpm
をRUNしていますが、下記のエラーが出てしまいDocker buildが失敗します。

また、ローカル環境では成功し、
AWSのcodebuildを利用すると失敗します。

原因がわかる方いらっしゃいましたらご教示願います。

Log
1~~（省略）~~
2
3Step 1/23 : FROM centos 
4latest: Pulling from library/centos 
5729ec3a6ada3: Pulling fs layer 
6729ec3a6ada3: Verifying Checksum 
7729ec3a6ada3: Download complete 
8729ec3a6ada3: Pull complete 
9Digest: sha256:f94c1d9--
10Status: Downloaded newer image for centos:latest 
11Step 2/23 : RUN yum install -y https://centos7.iuscommunity.org/ius-release.rpm -y 
12CentOS-8 - AppStream                            1.9 MB/s | 5.2 MB     00:02     
13CentOS-8 - Base                                 1.3 MB/s | 2.2 MB     00:01     
14CentOS-8 - Extras                               1.3 kB/s | 2.1 kB     00:01     
15Last metadata expiration check: 0:00:01 ago on Mon Oct 28 05:18:38 2019. 
16ius-release.rpm                                 3.1 kB/s | 8.2 kB     00:02     
17·[91mError:  
18 Problem: conflicting requests 
19  - nothing provides epel-release = 7 needed by ius-release-2-1.el7.ius.noarch 
20·[0m(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages) 
21The command '/bin/sh -c yum install -y https://centos7.iuscommunity.org/ius-release.rpm -y' returned a non-zero code: 1 
22 
23[Container] 2019/10/28 05:18:42 Command did not exit successfully docker build -t $ECR_REPOSITORY_NAME . exit status 1 
24[Container] 2019/10/28 05:18:42 Phase complete: BUILD State: FAILED