build source rpm inside a container

A new build target `build-srpm` builds mscp src.rpm inside a docker
container. The src.rpm can be published at COPR.

rpm/.gitignore

@@ -0,0 +1,3 @@
+
+# generated by cmake
+mscp.spec

rpm/README.md

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+
+## Build mscp as src.rpm for publishing at COPR
+
+### How to build
+
+```shell-session
+cd mscp
+mkdir build && cd build
+
+cmake ..  make build-srpm
+```
+
+`make build-srpm` builds mscp src.rpm inside a docker container.
+
+After that, there is `mscp-0.1.3-1.el9.src.rpm` under the `build`
+directory. The next step for publishing is to upload the src.rpm to
+[coprs/upaaa/mscp](https://copr.fedorainfracloud.org/coprs/upaaa/mscp/build/6983569/).

rpm/mscp.spec.in

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+Name:		mscp
+Version:	@MSCP_VERSION@
+Release:	1%{?dist}
+Summary:	mscp, fast file transfer over multiple SSH connections
+
+Group:		Applications/Internet
+License:	GPLv3
+URL:		https://github.com/upa/mscp
+Source0:	%{name}-%{version}.tar.gz
+
+BuildRequires:	gcc make cmake zlib-devel openssl-devel
+Requires:	glibc crypto-policies krb5-libs openssl-libs libcom_err
+
+%description
+mscp transfers files over multiple SSH connections. Multiple threads
+and connections in mscp transfer (1) multiple files simultaneously
+and (2) a large file in parallel. It would shorten the waiting time
+for transferring a lot of/large files over networks.
+
+
+%global debug_package %{nil}
+
+%prep
+%setup -q
+
+
+%build
+cmake -S . -B build -DINSTALL_EXECUTABLE_ONLY=ON
+make -C build %{?_smp_mflags}
+
+
+%install
+make -C build install DESTDIR=%{buildroot}
+
+%files
+/usr/local/bin/mscp
+/usr/local/share/man/man1/mscp.1
+
+
+%changelog
+* Sat Feb 03 2024 Ryo nakamura <upa@haeena.net> - 0.1.3-0
+- Initial release for rpm packaging