buildx: build history export

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/fixtures/hello.Dockerfile

@@ -0,0 +1,20 @@
+# syntax=docker/dockerfile:1
+
+# Copyright 2024 actions-toolkit authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM busybox
+ARG NAME=foo
+ARG TARGETPLATFORM
+RUN echo "Hello $NAME from $TARGETPLATFORM"