add rocky 8.6 support

docker/README.md

@@ -9,6 +9,8 @@ docker build -t mscp-ubuntu:20.04 -f docker/ubuntu-20.04.Dockerfile .
 docker build -t mscp-ubuntu:22.04 -f docker/ubuntu-22.04.Dockerfile .
 
 docker build -t mscp-centos:8 -f docker/centos-8.Dockerfile .
+
+docker build -t mscp-rocky:8.6 -f docker/rocky-8.6.Dockerfile .
 ```
 
 Test `mscp` in the containers.
@@ -19,6 +21,8 @@ docker run --init --rm mscp-ubuntu:20.04 /mscp/scripts/test-in-container.sh
 docker run --init --rm mscp-ubuntu:22.04 /mscp/scripts/test-in-container.sh
 
 docker run --init --rm mscp-centos:8 /mscp/scripts/test-in-container.sh
+
+docker run --init --rm mscp-rocky:8.6 /mscp/scripts/test-in-container.sh
 ```
 
 Retrieve deb/rpm packages.
@@ -32,6 +36,9 @@ docker run --rm -v (pwd):/out mscp-ubuntu:22.04 \
 
 docker run --rm -v (pwd):/out mscp-centos:8 \
        cp /mscp/build/mscp_0.0.0-centos-8-x86_64.rpm /out/
+
+docker run --rm -v (pwd):/out mscp-rocky:8.6 \
+       cp /mscp/build/mscp_0.0.0-rocky-8.6-x86_64.rpm /out/
 ```
 
 I don't know whether these are good way.

docker/rocky-8.6.Dockerfile

@@ -0,0 +1,30 @@
+FROM rockylinux:8.6
+
+ARG mscpdir="/mscp"
+
+COPY . ${mscpdir}
+
+# install numpy and pytest, sshd for test, and rpm-build
+RUN set -ex && yum -y update && yum -y install \
+	python3 python3-pip openssh openssh-server openssh-clients rpm-build
+
+RUN python3 -m pip install numpy pytest
+
+
+# preparation for sshd
+RUN  mkdir /var/run/sshd        \
+	&& ssh-keygen -A	\
+        && ssh-keygen -f /root/.ssh/id_rsa -N ""                \
+        && mv /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys
+
+# install build dependency
+RUN ${mscpdir}/scripts/install-build-deps.sh
+
+# build
+RUN cd ${mscpdir}			\
+        && rm -rf build			\
+        && cmake -B build -DBUILD_PKG=1 \
+        && cd ${mscpdir}/build          \
+	&& make				\
+	&& cpack -G RPM CPackConfig.cmake
+