feat: add src volume for lms-worker #669

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	22m 38s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	16m 55s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	21m 40s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	17m 18s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 53s
run_ci (ubuntu-20.04, 3.11, xqueue)	2m 52s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	22m 37s
run_ci (ubuntu-20.04, 3.11, designer+lms)	18m 11s
run_ci (ubuntu-20.04, 3.11, enterprise-catalog+enterprise-access+lms)	23m 8s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	17m 25s
	3h 0m 37s

Provide feedback