Update cloudbuild to not fail when copy the images

[cpanato]

Summary

• Update cloudbuild to not fail when copying the images

rehearsal: https://github.com/cpanato/rekor/releases/tag/v99.99.00

$ docker run gcr.io/cpanato-general/rekor-server:v99.99.00 version
Unable to find image 'gcr.io/cpanato-general/rekor-server:v99.99.00' locally
v99.99.00: Pulling from cpanato-general/rekor-server
b0b160e41cf3: Already exists
14b53aa26cd0: Already exists
afc8f3960014: Already exists
250c06f7c38e: Already exists
adbcc79b3314: Pull complete
Digest: sha256:e5fccf1dd5d599e5525f3eb442540386e8d1899800a5d36878e8f49d1f146fb4
Status: Downloaded newer image for gcr.io/cpanato-general/rekor-server:v99.99.00
2022-04-13T07:51:48.227Z        DEBUG   app/root.go:90  pprof enabled false
  ____    _____   _  __   ___    ____            ____    _____   ____   __     __  _____   ____
 |  _ \  | ____| | |/ /  / _ \  |  _ \          / ___|  | ____| |  _ \  \ \   / / | ____| |  _ \
 | |_) | |  _|   | ' /  | | | | | |_) |  _____  \___ \  |  _|   | |_) |  \ \ / /  |  _|   | |_) |
 |  _ <  | |___  | . \  | |_| | |  _ <  |_____|  ___) | | |___  |  _ <    \ V /   | |___  |  _ <
 |_| \_\ |_____| |_|\_\  \___/  |_| \_\         |____/  |_____| |_| \_\    \_/    |_____| |_| \_\
rekor-server: Rekor signature transparency log server

GitVersion:    v99.99.00
GitCommit:     5d1323bf309d4b1ca55afc4afdab366d2f0d8016
GitTreeState:  clean
BuildDate:     2022-04-13T07:28:51Z
GoVersion:     go1.17.8
Compiler:      gc
Platform:      linux/arm64

Ticket Link

n/a

Release Note

NONE

[codecov-commenter]

Codecov Report

Merging #773 (b3c526c) into main (72a7b00) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #773      +/-   ##
==========================================
- Coverage   48.84%   48.75%   -0.09%     
==========================================
  Files          62       62              
  Lines        5575     5575              
==========================================
- Hits         2723     2718       -5     
- Misses       2557     2561       +4     
- Partials      295      296       +1     

Impacted Files	Coverage Δ
pkg/types/helm/v0.0.1/entry.go	52.41% <0.00%> (-1.21%)	⬇️
pkg/types/tuf/v0.0.1/entry.go	42.32% <0.00%> (-0.75%)	⬇️
pkg/types/rekord/v0.0.1/entry.go	50.90% <0.00%> (-0.61%)	⬇️
pkg/types/rpm/v0.0.1/entry.go	61.90% <0.00%> (-0.37%)	⬇️
pkg/types/alpine/v0.0.1/entry.go	62.40% <0.00%> (+1.16%)	⬆️

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