added support for migrator.databaseAuthOverrideEnvVars in sourcegraph-migrator job

Author: loujar

charts/sourcegraph-migrator/templates/migrator/sourcegraph-migrator.Job.yaml

@@ -40,9 +40,11 @@ spec:
         imagePullPolicy: {{ .Values.sourcegraph.image.pullPolicy }}
         args: {{- default (list "up") .Values.migrator.args | toYaml | nindent 8 }}
         env:
+        {{- if not .Values.migrator.databaseAuthOverrideEnvVars }}
         {{- include "sourcegraph.databaseAuth" (list . "pgsql" "PG") | nindent 8 }}
         {{- include "sourcegraph.databaseAuth" (list . "codeIntelDB" "CODEINTEL_PG") | nindent 8 }}
         {{- include "sourcegraph.databaseAuth" (list . "codeInsightsDB" "CODEINSIGHTS_PG") | nindent 8 }}
+        {{- end }}
         {{- range $name, $item := .Values.migrator.env }}
         - name: {{ $name }}
         {{- $item | toYaml | nindent 10 }}