Merge pull request #201 from apple/fix-5.3-dockerfiles

Don't use yum update in the Dockerfile

Author: shahmishal

5.3/amazonlinux/2/Dockerfile

@@ -2,7 +2,7 @@ FROM amazonlinux:2
 LABEL maintainer="Swift Infrastructure <[email protected]>"
 LABEL description="Docker Container for the Swift programming language"
 
-RUN yum -y update && yum -y install \
+RUN yum -y install \
   binutils \
   gcc \
   git \

5.3/amazonlinux/2/slim/Dockerfile

@@ -29,7 +29,7 @@ RUN set -e; \
     && gpg --batch --quiet --keyserver ha.pool.sks-keyservers.net --recv-keys "$SWIFT_SIGNING_KEY" \
     && gpg --batch --verify swift.tar.gz.sig swift.tar.gz \
     # - Unpack the toolchain, set libs permissions, and clean up.
-    && yum -y update && yum -y install tar gzip \
+    && yum -y install tar gzip \
     && tar -xzf swift.tar.gz --directory / --strip-components=1 $SWIFT_VERSION-$SWIFT_PLATFORM/usr/lib/swift/linux \
     && chmod -R o+r /usr/lib/swift \
     && rm -rf "$GNUPGHOME" swift.tar.gz.sig swift.tar.gz \

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 \