Remove any existing build log

src/freedombone-ci

@@ -202,6 +202,11 @@ fi
 
 build_log_filename="${web_dir}/buildlog_${PROJECT_NAME}-${targetstr}.txt"
 
+# remove any existing build log
+if [ -f "$build_log_filename" ]; then
+    rm "$build_log_filename"
+fi
+
 # install from the source directory
 cd "${source_directory}" || exit 1
 git stash