Fix rust_image

[UebelAndre]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: #1949

What is the new behavior?

Fixes #1949

Does this PR introduce a breaking change?

• Yes
• No

Other information

closes #1949

[UebelAndre]

This PR is blocked by a series of failures unrelated to the changes here.

================================================================================
==================== Test output for //tests/container:alpine_custom_attr_digest_test:
/private/var/tmp/_bazel_buildkite/f9511fe9dd152becd17d41841444d68d/sandbox/darwin-sandbox/724/execroot/io_bazel_rules_docker/bazel-out/darwin-fastbuild/bin/tests/container/alpine_custom_attr_digest_test.runfiles/io_bazel_rules_docker/tests/container/alpine_custom_attr_digest_test_impl.sh.dat 2021-11-05 15:11:49.000000000 +0000
/private/var/tmp/_bazel_buildkite/f9511fe9dd152becd17d41841444d68d/sandbox/darwin-sandbox/724/execroot/io_bazel_rules_docker/bazel-out/darwin-fastbuild/bin/tests/container/alpine_custom_attr_digest_test.runfiles/io_bazel_rules_docker/tests/container/new_push_test_legacy_from_container_img.digest 2021-11-05 15:11:52.000000000 +0000
@@ -1 +1 @@
-sha256:2f3bf2d061a1bab130cdd98f10b73dfceb08bfbf94a610c62f20c787073e5178
\ No newline at end of file
+sha256:63a40621b30af05f51fb2b38c2b5c56f9cc82cc605d556e09cacdbbdc5adec63
\ No newline at end of file

[gravypod]

This change looks good but it looks like some things are failing on mac:

//tests/container:alpine_custom_attr_digest_test
//tests/container:image_test
//tests/container:test_digest_output1

I don't know if your change effects these. Some other users have seen these issues with our CI (hashing failures on some targets). Would you mind trying to debug these to see if they're from your PR?

[UebelAndre]

They're not from my PR. The same failure occurs on #1948

[UebelAndre]

Deleting in favor of #1951

[dfreese]

Deleting in favor of #1951

Whoops, didn't look to see if this had come up previously!

[UebelAndre]

Deleting in favor of #1951

Whoops, didn't look to see if this had come up previously!

All good buddy 😃 just so long as the changes go in, I don't care who's name is on the PR