Adding ECR Helper for AL2. Ubuntu was not found

Author: JohnPreston

al2/x86_64/standard/3.0/Dockerfile

@@ -23,6 +23,7 @@ RUN set -ex \
     && rpm --import https://download.mono-project.com/repo/xamarin.gpg \
     && curl https://download.mono-project.com/repo/centos7-stable.repo | tee /etc/yum.repos.d/mono-centos7-stable.repo \
     && amazon-linux-extras enable corretto8 \
+    && amazon-linux-extras enable docker \
     && yum groupinstall -y "Development tools" \
     && yum install -y \
            GeoIP-devel ImageMagick asciidoc bzip2-devel bzr bzrtools cvs cvsps \
@@ -36,6 +37,7 @@ RUN set -ex \
            perl-DBI perl-HTTP-Date perl-IO-Pty-Easy perl-TimeDate perl-YAML-LibYAML \
            postgresql-devel procps-ng python-configobj readline-devel rsync sgml-common \
            subversion-perl tar tcl tk vim wget which xfsprogs xmlto xorg-x11-server-Xvfb xz-devel \
+           amazon-ecr-credential-helper \
     && rm /etc/yum.repos.d/mono-centos7-stable.repo
 
 RUN useradd codebuild-user