fix(dockerfile): EXPLGPF-106 up rok4/fullgeneration to 4.2.12 (new force push)

Closes EXPLGPF-106

tests/fixtures/update_wms/expected_output.json

@@ -118,7 +118,7 @@
         "type": "Feature"
       },
       "name": "mon_output",
-      "size": 2158821,
+      "size": 2158837,
       "srs": "EPSG:4326",
       "status": "GENERATING",
       "storage": {