Fix memory 'leak' (fix #240) #199

Job	Run time
check-release-needed	7s
check-release-needed	7s
call-workflow-min / create_tag	8s
call-workflow-min / create_tag	8s
call-workflow-min / josm-build	51s
call-workflow-min / josm-build	51s
call-workflow-latest / create_tag	3s
call-workflow-latest / create_tag	3s
call-workflow-latest / josm-build	1m 2s
call-workflow-latest / josm-build	1m 2s
call-workflow-min / plugin-build	2m 25s
call-workflow-min / plugin-build	2m 25s
call-workflow-latest / plugin-build	2m 31s
call-workflow-latest / plugin-build	2m 31s
call-workflow-min / plugin-test	6m 37s
call-workflow-min / plugin-test	6m 37s
call-workflow-latest / plugin-test	7m 8s
call-workflow-latest / plugin-test	6m 36s
call-workflow-min / release	5s
call-workflow-min / release	5s
add-mapillary-keys	12s
add-mapillary-keys	12s
call-workflow-latest / release	0s
call-workflow-latest / release	0s
	41m 46s

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