prefix BUILD in the build logs

mpsd-software-environment.py

@@ -44,7 +44,7 @@ config_vars = {
     ),
     #  Placeholder build log file name, placed at mpsd_microarch/logs
     "build_log_template": Template(
-        "${mpsd_release}_${mpsd_microarch}_${date}_${toolchain}_${action}.log"
+        "${mpsd_release}_${mpsd_microarch}_${date}_BUILD_${toolchain}_${action}.log"
     ),
     "metadata_tag_open": "!<meta>",
     "metadata_tag_close": "</meta>!",