Add build options for Docker image attestation control

Docker enables provenance by default which creates "manifest list"
instead of standard image. This causes issues when we generate a Docker
manifest with multi arch images later in the pipeline.

Signed-off-by: Rajath Agasthya <[email protected]>

Author: rajathagasthya

deployments/container/native-only.mk

@@ -12,7 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-DOCKER_BUILD_PLATFORM_OPTIONS = --platform=linux/amd64
+PUSH_ON_BUILD ?= false
+ATTACH_ATTESTATIONS ?= false
+DOCKER_BUILD_PLATFORM_OPTIONS ?= --platform=linux/amd64
+DOCKER_BUILD_OPTIONS = --output=type=image,push=$(PUSH_ON_BUILD) --provenance=$(ATTACH_ATTESTATIONS) --sbom=$(ATTACH_ATTESTATIONS)
 
 $(PUSH_TARGETS): push-%:
 	$(DOCKER) tag "$(IMAGE)" "$(OUT_IMAGE)"