Added CentOS RPM package building environment

Signed-off-by: Teddysun <i@teddysun.com>

docker/rpmbuild/Dockerfile.centos7

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+# Dockerfile for build RPM packages.
+# Copyright (C) 2021 Teddysun <i@teddysun.com>
+
+FROM --platform=${TARGETPLATFORM} centos:7
+LABEL maintainer="Teddysun <i@teddysun.com>"
+
+RUN yum install -y yum-utils epel-release centos-release-scl-rh && \
+	yum-config-manager --enable epel && \
+	yum install -y tar wget git tree gcc gcc-c++ \
+		sudo net-tools make cmake zstd libzstd \
+		python bash coreutils diffutils patch \
+		rpm-build rpm-devel rpmlint rpmdevtools \
+		devtoolset-9-gcc devtoolset-9-binutils devtoolset-9-runtime \
+		scl-utils asciidoc bison elfutils-libelf-devel m4 newt-devel \
+		openssl-devel openssl xmlto audit-libs-devel binutils-devel elfutils-devel \
+		gettext java-1.8.0-openjdk-devel libcap-devel numactl-devel python-devel python3 \
+		slang-devel xz-devel zlib-devel ncurses-devel pciutils-devel perl-ExtUtils-Embed && \
+	yum clean all && rm -rf /var/cache/yum /var/lib/rpm/__db*
+
+RUN useradd builder -u 1000 -m -G users,wheel && \
+	echo "builder ALL=(ALL:ALL) NOPASSWD:ALL" >> /etc/sudoers && \
+	echo "# macros"                           >  /home/builder/.rpmmacros && \
+	echo "%_topdir    /home/builder/rpmbuild" >> /home/builder/.rpmmacros && \
+	echo "%_sourcedir %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_builddir  %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_specdir   %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_rpmdir    %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_srcrpmdir %{_topdir}"             >> /home/builder/.rpmmacros && \
+	mkdir -p /home/builder/rpmbuild && \
+	chown -R builder /home/builder
+
+USER builder
+VOLUME /home/builder
+WORKDIR /home/builder/rpmbuild
+CMD ["/bin/bash"]

docker/rpmbuild/Dockerfile.centos8

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+# Dockerfile for build RPM packages.
+# Copyright (C) 2021 Teddysun <i@teddysun.com>
+
+FROM --platform=${TARGETPLATFORM} centos:8
+LABEL maintainer="Teddysun <i@teddysun.com>"
+
+RUN yum install -y yum-utils epel-release && \
+	yum-config-manager --enable epel && \
+	rpm -e --nodeps coreutils-single && \
+	yum install -y tar wget git tree gcc gcc-c++ \
+		sudo net-tools make cmake zstd libzstd \
+		bash coreutils diffutils patch \
+		rpm-build rpm-devel rpmlint rpmdevtools \
+		asciidoc audit-libs-devel binutils-devel flex \
+		libcap-devel newt-devel pciutils-devel perl-generators \
+		python3 python3-devel python3-docutils rsync xmlto bc bison \
+		java-devel ncurses-devel numactl-devel openssl-devel perl-devel \
+		elfutils-devel xz-devel perl-ExtUtils-Embed && \
+	yum clean all && rm -rf /var/cache/dnf /var/lib/rpm/__db*
+
+RUN useradd builder -u 1000 -m -G users,wheel && \
+	echo "builder ALL=(ALL:ALL) NOPASSWD:ALL" >> /etc/sudoers && \
+	echo "# macros"                           >  /home/builder/.rpmmacros && \
+	echo "%_topdir    /home/builder/rpmbuild" >> /home/builder/.rpmmacros && \
+	echo "%_sourcedir %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_builddir  %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_specdir   %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_rpmdir    %{_topdir}"             >> /home/builder/.rpmmacros && \
+	echo "%_srcrpmdir %{_topdir}"             >> /home/builder/.rpmmacros && \
+	mkdir -p /home/builder/rpmbuild && \
+	chown -R builder /home/builder
+
+USER builder
+VOLUME /home/builder
+WORKDIR /home/builder/rpmbuild
+CMD ["/bin/bash"]

docker/rpmbuild/README.md

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+## CentOS RPM package building environment by Teddysun
+
+This docker image can be used to build RPM packages.
+
+For more information on docker and containerization technologies, refer to [official document][1].
+
+## Supported tags and respective `Dockerfile` links
+
+- `latest`, `8` [*(Dockerfile)*][2]
+- `7` [*(Dockerfile)*][3]
+
+### Reference
+
+- Supported architectures ([*more info*][4]): `amd64`, `arm64v8`
+
+## Integration
+
+RPMs will be built in `/home/builder/rpmbuild` folder, which should contain source archives, patches and built RPM/SRPM files.
+
+## Prepare the host
+
+If you need to install docker by yourself, follow the [official installation guide][5].
+
+## User Account and Root Access
+
+The `builder` user (UID 1000) is a member of users and wheel, and has password-less sudo as any user, any group.
+
+## Pull the image
+
+For CentOS 7
+
+```bash
+$ docker pull teddysun/rpmbuild:7
+```
+
+For CentOS 8
+
+```bash
+$ docker pull teddysun/rpmbuild:8
+```
+
+It can be found at [Docker Hub][6].
+
+## Start a container
+
+There is an example to start a container for CentOS 7 like below:
+
+```bash
+$ mkdir -m 777 -p /opt/builder7
+$ docker run -it --rm --name rpmbuild7 -v /opt/builder7:/home/builder/rpmbuild teddysun/rpmbuild:7
+```
+
+There is an example to start a container for CentOS 8 like below:
+
+```bash
+$ mkdir -m 777 -p /opt/builder8
+$ docker run -it --rm --name rpmbuild8 -v /opt/builder8:/home/builder/rpmbuild teddysun/rpmbuild:8
+```
+
+[1]: https://docs.docker.com/
+[2]: https://github.com/teddysun/across/blob/master/docker/rpmbuild/Dockerfile.centos8
+[3]: https://github.com/teddysun/across/blob/master/docker/rpmbuild/Dockerfile.centos7
+[4]: https://github.com/docker-library/official-images#architectures-other-than-amd64
+[5]: https://docs.docker.com/install/
+[6]: https://hub.docker.com/r/teddysun/rpmbuild/