devel doc: how to test with latest Pacemaker source code

devel/howto-pacemaker-beta.md

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+# How to test with latest Pacemaker source code
+
+The has been tested on Centos 8 Stream.
+
+First, install some dependencies:
+
+~~~bash
+yum install --enablerepo=ha --enablerepo=powertools make git      \
+    corosync corosynclib corosynclib-devel python3 libqb-devel    \
+    bzip2-devel libxslt-devel libxml2-devel glib2-devel pkgconfig \
+    libuuid-devel libtool-ltdl-devel libtool autoconf automake    \
+    docbook-style-xsl gnutls-devel help2man ncurses-devel         \
+    pam-devel pkgconfig 'pkgconfig(dbus-1)' python3-devel         \
+    rpmdevtools rpmlint perl-TimeDate psmisc resource-agents
+~~~
+
+Get the source code and checkout the required tag/commit:
+
+~~~bash
+git clone https://github.com/ClusterLabs/pacemaker.git
+cd pacemaker
+git checkout Pacemaker-2.1.1-rc3
+~~~
+
+Build the code and RPM:
+
+~~~bash
+./autogen.sh
+./configure
+make rpm
+~~~
+
+Install pacemaker:
+
+~~~bash
+cd rpm/RPMS
+yum install ./x86_64/pacemaker-2.1.1-0.1.rc3.el8.x86_64.rpm              \
+            ./x86_64/pacemaker-cli-2.1.1-0.1.rc3.el8.x86_64.rpm          \
+            ./x86_64/pacemaker-libs-2.1.1-0.1.rc3.el8.x86_64.rpm         \
+            ./x86_64/pacemaker-cluster-libs-2.1.1-0.1.rc3.el8.x86_64.rpm \
+            ./noarch/pacemaker-schemas-2.1.1-0.1.rc3.el8.noarch.rpm
+~~~
+