Add the buildkit-cache workspace at a dummy mount point.

task/buildkit-rootless-daemonless/0.1/buildkit-rootless-daemonless.yaml

@@ -25,7 +25,8 @@ spec:
     - name: buildkit-cache
       description: For preserving buildkit type=cache mounts between builds.
       optional: true
-      mountPath: /home/user/.local/share/buildkit
+      mountPath: /home/user/.local/share/foo
+      # mountPath: /home/user/.local/share/buildkit
   params:
     - name: OUTPUT
       type: string
@@ -61,23 +62,13 @@ spec:
       description: Full URL to the docker image.
       type: array
   volumes:
+    - name: buildkitd
+      emptyDir: {}
     - name: buildkitd-toml
       emptyDir: {}
     - name: metadata-out
       emptyDir: {}
   steps:
-    - name: setup-cache-ownership
-      image: $(params.BUILDER_IMAGE)
-      workingDir: "$(workspaces.source.path)"
-      script: |
-        #!/usr/bin/env sh
-        set -euo pipefail
-        chown 1000:1000 /home/user/.local/share/buildkit
-        chmod 0777 /home/user/.local/share/buildkit
-      securityContext:
-        runAsNonRoot: false
-        runAsUser: 0
-        runAsGroup: 0
     - name: write-config
       image: $(params.BUILDER_IMAGE)
       workingDir: "$(workspaces.source.path)"
@@ -101,6 +92,8 @@ spec:
         EOF
         chmod +x /home/user/.config/buildkit/entrypoint.sh
       volumeMounts:
+        - name: buildkitd
+          mountPath: /home/user/.local/share/buildkittwo
         - name: buildkitd-toml
           mountPath: /home/user/.config/buildkit
       securityContext:
@@ -124,6 +117,8 @@ spec:
         - /home/user/.metadata/build.json
         - $(params.EXTRA_ARGS)
       volumeMounts:
+        - name: buildkitd
+          mountPath: /home/user/.local/share/buildkittwo
         - name: buildkitd-toml
           mountPath: /home/user/.config/buildkit
           readOnly: true