Various updates & fixes

Copy the following into your WORKSPACE file to use rules_docker at release v0.22.0

http_archive(
    name = "io_bazel_rules_docker",
    sha256 = "59536e6ae64359b716ba9c46c39183403b01eabfbd57578e84398b4829ca499a",
    strip_prefix = "rules_docker-0.22.0",
    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.22.0/rules_docker-v0.22.0.tar.gz"],
)

BREAKING CHANGES

Previous releases of rules_docker determined when to make non-deterministic, VCS-stamped outputs based on whether a { character appeared in certain attributes. Some rules had a (deprecated) stamp boolean attribute which affected this behavior all builds of that target. This makes it easy to accidentally bust the Bazel cache, for example a test that depends on a container_image might re-run every time because the image's tag changed with each git SHA.

As of this release, you should run bazel build --stamp enable stamped outputs.

To override this on a single target, the stamp attribute on these three rules is now a trinary, just like in other rulesets like rules_python

• in place of stamp = False you should use stamp = "@io_bazel_rules_docker//stamp:never"
• in place of stamp = True you should use stamp = "@io_bazel_rules_docker//stamp:always"
• if no value for stamp attribute is given, the default is based on the --[no]stamp configuration of the build.

For more ideas on using this, see the blog post by the author of the stamping PR: https://blog.aspect.dev/stamping-bazel-builds-with-selective-delivery

What's Changed

• feat: add timeout attribute to container_pull by @alexeagle in #1960
• Add target as an attribute to dockerfile_build by @jakegut in #1944
• Add digests of the images being used for examples by @tetsuok in #1964
• fix: add label to tar warning message by @mattem in #1967
• Base stamping decisions on --stamp configuration, not attributes on t… by @alexeagle in #1878
• container_push: add skip_unchanged_digest attribute by @sluongng in #1744
• Don't print output of ExtractImageId mnemonics when successful by @alexeagle in #1969
• update distroless images by @dattto in #1971
• container_load: use cfg="exec" instead of cfg="host" by @Yannic in #1976
• container/bundle.bzl: improve bundle rules doc by @sluongng in #1975
• Add generated comment in generated file by @alexeagle in #1894
• Add tool target attribute to docker toolchain by @moshe in #1946
• toolchain: allow to configure build_tar target by @dataoleg in #1937

New Contributors

• @jakegut made their first contribution in #1944
• @tetsuok made their first contribution in #1964
• @mattem made their first contribution in #1967
• @sluongng made their first contribution in #1744
• @dattto made their first contribution in #1971
• @Yannic made their first contribution in #1976
• @moshe made their first contribution in #1946
• @dataoleg made their first contribution in #1937

Full Changelog: v0.21.0...v0.22.0