Fixed findings

List of Findings

Error: SHELLCHECK_WARNING (CWE-563): [#def1]
/usr/share/buildah/test/system/blobcache.bats:88:3: warning[SC2034]: cachedir appears unused. Verify use (or export if used externally).
#   86|   	if is_rootless;
#   87|   	then
#   88|-> 		cachedir=$HOME/.local/share
#   89|   	fi
#   90|   	run rm -rf $blobcachedir/*

Error: SHELLCHECK_WARNING (CWE-457): [#def2]
/usr/share/buildah/test/system/blobcache.bats:91:44: warning[SC2154]: cachefile is referenced but not assigned.
#   89|   	fi
#   90|   	run rm -rf $blobcachedir/*
#   91|-> 	assert "$status" -eq 0 "status of `run rm $cachefile` must be 0"
#   92|   
#   93|   	# In first push blob must be skipped after vendoring https://github.com/containers/image/pull/1645

Error: SHELLCHECK_WARNING (CWE-156): [#def3]
/usr/share/buildah/test/system/test_runner.sh:16:22: warning[SC2046]: Quote this to prevent word splitting.
#   14|   
#   15|   # Run the tests.
#   16|-> execute time bats -j $(nproc) --tap "${@:-.}"

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