Fix file permission issue while doing untar of cache archive #100

Namespace: <a href="https://detailurl.setting.custom-console-url-namespace.is.not.configured" rel="nofollow">tekton-ecosystem-tenant
PipelineRun: <a href="https://console.redhat.com/application-pipeline/ns/tekton-ecosystem-tenant/pipelinerun/tekton-caches-main-cache-on-pull-request-zh565" rel="nofollow">tekton-caches-main-cache-on-pull-request-zh565

Success

Red Hat Konflux/tekton-caches-main-cache-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	22 seconds	init
✅ Succeeded	23 seconds	clone-repository
✅ Succeeded	26 seconds	prefetch-dependencies
✅ Succeeded	3 minutes	build-container
✅ Succeeded	46 seconds	deprecated-base-image-check
✅ Succeeded	2 minutes	clamav-scan
✅ Succeeded	2 minutes	sast-snyk-check
✅ Succeeded	2 minutes	push-dockerfile
✅ Succeeded	46 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	43 seconds	apply-tags
✅ Succeeded	1 minute	clair-scan
✅ Succeeded	1 minute	build-source-image
✅ Succeeded	8 seconds	show-sbom
✅ Succeeded	35 seconds	show-summary