Revert "integrate buildkitd in runner containers"

This reverts commit 6c953ba4f3.

gitea-runner/buildkitd/deployment.yaml

@@ -5,7 +5,7 @@ metadata:
   namespace: gitea-runner
 spec:
   progressDeadlineSeconds: 600
-  replicas: 0
+  replicas: 3
   revisionHistoryLimit: 10
   selector:
     matchLabels:

gitea-runner/statefulset.yaml

@@ -59,19 +59,6 @@ spec:
         volumeMounts:
           - mountPath: /certs
             name: docker-certs
-      - name: buildkitd
-        args:
-          - --addr
-          - tcp://127.0.0.20:1234
-        image: moby/buildkit:v0.27.1
-        imagePullPolicy: Always
-        ports:
-        - containerPort: 1234
-          protocol: TCP
-        securityContext:
-          privileged: true
-        terminationMessagePath: /dev/termination-log
-        terminationMessagePolicy: File
       dnsPolicy: ClusterFirst
       hostNetwork: true
       restartPolicy: Always