Update the nightlies not to use yum update, as per changes to nightly-master

gwynne · gwynne · commit 36fbe1aa08a7 · 2020-08-16T03:29:45.000-05:00
diff --git a/nightly-5.2/amazonlinux/2/Dockerfile b/nightly-5.2/amazonlinux/2/Dockerfile
@@ -2,7 +2,7 @@ FROM amazonlinux:2
 LABEL maintainer="Swift Infrastructure <swift-infrastructure@swift.org>"
 LABEL description="Docker Container for the Swift programming language"
 
-RUN yum -y update && yum -y install \
+RUN yum -y install \
   binutils \
   gcc \
   git \
diff --git a/nightly-5.2/centos/8/Dockerfile b/nightly-5.2/centos/8/Dockerfile
@@ -4,7 +4,7 @@ LABEL description="Docker Container for the Swift programming language"
 
 RUN yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
 
-RUN yum -y update && yum install --enablerepo=PowerTools -y \
+RUN yum install --enablerepo=PowerTools -y \
   binutils \
   gcc \
   git \
diff --git a/nightly-5.3/amazonlinux/2/Dockerfile b/nightly-5.3/amazonlinux/2/Dockerfile
@@ -2,7 +2,7 @@ FROM amazonlinux:2
 LABEL maintainer="Swift Infrastructure <swift-infrastructure@swift.org>"
 LABEL description="Docker Container for the Swift programming language"
 
-RUN yum -y update && yum -y install \
+RUN yum -y install \
   binutils \
   gcc \
   git \
diff --git a/nightly-5.3/centos/8/Dockerfile b/nightly-5.3/centos/8/Dockerfile
@@ -4,7 +4,7 @@ LABEL description="Docker Container for the Swift programming language"
 
 RUN yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
 
-RUN yum -y update && yum install --enablerepo=PowerTools -y \
+RUN yum install --enablerepo=PowerTools -y \
   binutils \
   gcc \
   git \
