Only look for the layer digests in the Layers field.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

systemtest/010-inspect.bats

@@ -34,9 +34,10 @@ load helpers
     # Each SHA-named layer file (but not the config) must be listed in the output of 'inspect'.
     # As of Skopeo 1.6, (skopeo inspect)'s output lists layer digests,
     # but not the digest of the config blob ($config_digest), if any.
+    layers=$(jq -r '.Layers' <<<"$inspect_local")
     for sha in $(find $workdir -type f | xargs -l1 basename | egrep '^[0-9a-f]{64}$'); do
         if [ "sha256:$sha" != "$config_digest" ]; then
-            expect_output --from="$inspect_local" --substring "sha256:$sha" \
+            expect_output --from="$layers" --substring "sha256:$sha" \
                         "Locally-extracted SHA file is present in 'inspect'"
         fi
     done