fix: added Dockerfile and config to update yarn_gpg_key (#211) #1123

Job	Run time
run_ci (ubuntu-latest, 3.11, edx-exams+lms)	19m 4s
run_ci (ubuntu-latest, 3.11, license-manager+lms)	18m 41s
run_ci (ubuntu-latest, 3.11, credentials+lms)	19m 53s
run_ci (ubuntu-latest, 3.11, discovery+lms+forum)	21m 40s
run_ci (ubuntu-latest, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	27m 32s
run_ci (ubuntu-latest, 3.11, ecommerce+lms)	23m 54s
run_ci (ubuntu-latest, 3.11, analyticsapi+insights+lms)	24m 24s
run_ci (ubuntu-latest, 3.11, xqueue)	1m 59s
run_ci (ubuntu-latest, 3.11, designer+lms)	19m 22s
run_ci (ubuntu-latest, 3.11, edx_notes_api+lms)	20m 24s
run_ci (ubuntu-latest, 3.11, registrar+lms)	19m 37s
	3h 36m 30s

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