Fix for some arm64 machines.

As said in GoogleContainerTools/distroless#657, in the past, distroless/base:debug used an arm32 busybox binary in its arm64 image. Which doesn't work on some arm64 machines, e.g., Ubuntu 21 arm64 on Parallel Desktop on Apple Silicon M1. It caused this error:
"
$ docker run -it gcr.io/distroless/base@sha256:cfdc553400d41b47fd231b028403469811fcdbc0e69d66ea8030c5a0b5fbac2b
standard_init_linux.go:228: exec user process caused: exec format error
"

This PR GoogleContainerTools/distroless#960 fixes this bug. Hence, update the distroless/base:debug used by Tekton Pipeline in this commit.

config/controller.yaml

@@ -76,9 +76,9 @@ spec:
           # This is gcr.io/google.com/cloudsdktool/cloud-sdk:302.0.0-slim
           "-gsutil-image", "gcr.io/google.com/cloudsdktool/cloud-sdk@sha256:27b2c22bf259d9bc1a291e99c63791ba0c27a04d2db0a43241ba0f1f20f4067f",
           # The shell image must be root in order to create directories and copy files to PVCs.
-          # gcr.io/distroless/base:debug as of October 21, 2021
+          # gcr.io/distroless/base:debug as of February 17, 2022
           # image shall not contains tag, so it will be supported on a runtime like cri-o
-          "-shell-image", "gcr.io/distroless/base@sha256:cfdc553400d41b47fd231b028403469811fcdbc0e69d66ea8030c5a0b5fbac2b",
+          "-shell-image", "gcr.io/distroless/base@sha256:3cebc059e7e52a4f5a389aa6788ac2b582227d7953933194764ea434f4d70d64",
           # for script mode to work with windows we need a powershell image
           # pinning to nanoserver tag as of July 15 2021
           "-shell-image-win", "mcr.microsoft.com/powershell:nanoserver@sha256:b6d5ff841b78bdf2dfed7550000fd4f3437385b8fa686ec0f010be24777654d6",