Add migration commands for SQLite; not PGSql

cmake/dbActionShared.cmake

@@ -0,0 +1,20 @@
+include_guard(GLOBAL)
+
+function(_cppbessot_db_action_validate_basename value kind relative_root)
+  if("${value}" STREQUAL "")
+    message(FATAL_ERROR "${kind} must not be empty.")
+  endif()
+
+  if("${value}" MATCHES "[/\\\\]")
+    message(FATAL_ERROR
+      "${kind} `${value}` must be a basename under ${relative_root}, not a path.")
+  endif()
+endfunction()
+
+function(_cppbessot_db_action_validate_db_target_impl db_target)
+  if(NOT "${db_target}" STREQUAL "prod"
+     AND NOT "${db_target}" STREQUAL "proddev"
+     AND NOT "${db_target}" STREQUAL "dev")
+    message(FATAL_ERROR "DB_TARGET must be one of: prod, proddev, dev.")
+  endif()
+endfunction()