MDEV-14938 make buildbot to include galera into bintars

allow injecting extra files into the bintar

CMakeLists.txt

@@ -394,6 +394,7 @@ IF(WITH_UNIT_TESTS)
  ENDIF()
 ENDIF()
 
+INCLUDE(cpack_tgz)
 INCLUDE(cpack_rpm)
 INCLUDE(cpack_deb)
 

cmake/cpack_tgz.cmake

@@ -0,0 +1,10 @@
+IF(NOT RPM AND NOT DEB)
+  #
+  # use -DEXTRA_FILES='/path/to/file=where/to/install;/bin/dd=bin;...'
+  #
+  FOREACH(f ${EXTRA_FILES})
+    STRING(REGEX REPLACE "=.*$" "" from ${f})
+    STRING(REGEX REPLACE "^.*=" "" to   ${f})
+    INSTALL(PROGRAMS ${from} DESTINATION ${to})
+  ENDFOREACH()
+ENDIF()