Dockerfile: reformat, yum/dnf, use update-minimal

deploy-to-obs/Dockerfile

@@ -5,20 +5,17 @@ WORKDIR /root
 
 COPY openSUSE_Tools-repomd.xml.key /etc/yum.repos.d
 
-RUN chmod 775 \
-  /root \
-  && \
-  mkdir -m 775 -p /root/.config/osc/trusted-certs \
-  && \
-  cd /etc/yum.repos.d/ && \
-  curl -LO https://download.opensuse.org/repositories/openSUSE:Tools/CentOS_8/openSUSE:Tools.repo && \
-  rpm --import openSUSE_Tools-repomd.xml.key && \
-  cd - \
-  && \
-  yum update -y && yum install -y epel-release && yum install -y \
-  osc \
-  && \
-  yum clean all -y
+RUN chmod 775 /root \
+  && mkdir -m 775 -p /root/.config/osc/trusted-certs \
+  && pushd /etc/yum.repos.d/ \
+  && curl -LO https://download.opensuse.org/repositories/openSUSE:Tools/CentOS_8/openSUSE:Tools.repo \
+  && rpm --import openSUSE_Tools-repomd.xml.key \
+  && popd \
+  && dnf install -y epel-release \
+  && dnf -y update-minimal --setopt=tsflags=nodocs \
+      --security --sec-severity=Important --sec-severity=Critical \
+  && dnf -y install --setopt=tsflags=nodocs osc \
+  && dnf clean all -y
 
 COPY entrypoint.sh /