cmd-build: Conditionally change the packing structure of container-image

When the previous build exists, use its packing structure otherwise container-encapsulate
generates a new one

src/cmd-build

@@ -452,18 +452,31 @@ else
                  "--label=io.openshift.build.versions=machine-os=${buildid}"
                 )
     fi
+
+    last_build_manifest=()
+    #Use the last stable release if buildfetch used
+    if [ -n "${PARENT_BUILD}" ]; then
+      last_build_manifest+=("--previous_build_manifest=${parent_builddir}/${name}-${PARENT_BUILD}-ostree.${basearch}-manifest.json")
+    #Use the previous local build
+    elif [ -n "${previous_build}" ]; then
+      last_build_manifest+=("--previous_build_manifest=${previous_builddir}/${name}-${previous_build}-ostree.${basearch}-manifest.json")
+    fi
     runv rpm-ostree compose container-encapsulate --max-layers="$MAX_OSTREECONTAINER_LAYERS" --format-version=1 \
         --repo="${tmprepo}" \
         --label="coreos-assembler.image-config-checksum=${image_config_checksum}" \
         --label="coreos-assembler.image-input-checksum=${image_input_checksum}" \
         --label="org.opencontainers.image.source=${gitsrc}" \
         --label="org.opencontainers.image.revision=${config_gitrev}" \
         --copymeta-opt=fedora-coreos.stream \
+        "${last_build_manifest[@]}" \
         "${labels[@]}" \
         "${buildid}" \
         oci-archive:"${ostree_tarfile_path}".tmp:latest
     /usr/lib/coreos-assembler/finalize-artifact "${ostree_tarfile_path}"{.tmp,}
     ostree_tarfile_sha256=$(sha256sum "${ostree_tarfile_path}" | awk '{print$1}')
+    ostree_oci_manifest_path="${name}-${buildid}-ostree.${basearch}-manifest.json"
+    skopeo inspect --raw oci-archive:"${ostree_tarfile_path}" > tmp/manifest.json
+    /usr/lib/coreos-assembler/finalize-artifact tmp/manifest.json "${ostree_oci_manifest_path}"
 fi
 
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