feat: disable provenance when building images

`buildx` introduced SLSA provenance attestation which breaks
our images in the registry and for older clients.
Thus, we disable it for now.
You can see the change in the `buildx` changelog of buildx.

Closes https://gitlab.com/gitlab-org/terraform-images/-/issues/104

.gitlab-ci.yml

@@ -104,12 +104,18 @@ build:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
   script:
     - docker buildx create --use
+    # NOTE: we disable provenance for now,
+    # because it causes troubles with the registry and older clients.
+    # See
+    # - https://gitlab.com/gitlab-org/terraform-images/-/issues/104
+    # - https://gitlab.com/gitlab-org/terraform-images/-/merge_requests/184#note_1328485943
     - docker buildx build
       --platform "$PLATFORMS"
       --build-arg BASE_IMAGE=$BASE_IMAGE
       --build-arg TERRAFORM_BINARY_VERSION=$TERRAFORM_BINARY_VERSION
       --file Dockerfile
       --tag "$BUILD_IMAGE_NAME"
+      --provenance=false
       --push
       .