Use common args in compactor and index-gateway (#4824)

Signed-off-by: Danny Kopping <danny.kopping@grafana.com>

production/ksonnet/loki/boltdb_shipper.libsonnet

@@ -41,8 +41,7 @@
     pvc.mixin.spec.withStorageClassName($._config.compactor_pvc_class)
   else {},
 
-  compactor_args:: if $._config.using_boltdb_shipper then {
-    'config.file': '/etc/loki/config/config.yaml',
+  compactor_args:: if $._config.using_boltdb_shipper then $._config.commonArgs {
     'boltdb.shipper.compactor.working-directory': '/data/compactor',
     'boltdb.shipper.compactor.shared-store': $._config.boltdb_shipper_shared_store,
     target: 'compactor',

production/ksonnet/loki/index-gateway.libsonnet

@@ -30,8 +30,7 @@
     pvc.mixin.spec.withStorageClassName($._config.index_gateway_pvc_class)
   else {},
 
-  index_gateway_args:: if $._config.use_index_gateway then {
-    'config.file': '/etc/loki/config/config.yaml',
+  index_gateway_args:: if $._config.use_index_gateway then $._config.commonArgs {
     target: 'index-gateway',
   } else {},