Tolerate x86 architecture in drone-runner

This will cause some builds to fail (or, possibly, to build unusable
images), until their builds are migrated to use
https://github.com/thegeeklab/drone-docker-buildx

charts/drone/values.yaml

@@ -10,7 +10,6 @@ drone-server:
     port: 3500
   persistentVolume:
     storageClass: longhorn
-  # Keep the Runner untolerant for now, until I progress to intentionally building dual-architecture images.
   tolerations:
   - key: architecture
     operator: Equal
@@ -26,6 +25,10 @@ drone-runner:
       - "--host"
       - "tcp://localhost:2375"
       - "--mtu=1450"
+  tolerations:
+  - key: architecture
+    operator: Equal
+    value: x86
 
 drone:
   server: "drone.scubbo.org"