Add instructions for using specific bazel-bats source releases

[filmil]

At the moment, README.md contains only the instructions on how to use top-of-tree code.

We should add instructions for using specific source releases too.

[pfiaux]

We're using something a like that:

BAZEL_BATS_VERSION = "0.33.0"
BAZEL_BATS_SHA256 = "916a3e9ec2d2a9d196b84fa5ae2251a06acf891952df2134c10fe5314a8bbabc"

http_archive(
    name = "bazel_bats",
    sha256 = BAZEL_BATS_SHA256,
    strip_prefix = "bazel-bats-%s" % BAZEL_BATS_VERSION,
    url = "https://github.com/filmil/bazel-bats/archive/refs/tags/v%s.tar.gz" % BAZEL_BATS_VERSION,
)

load("@bazel_bats//:deps.bzl", "bazel_bats_dependencies")

bazel_bats_dependencies()

Would that work or do you have something else in mind?

[filmil]

What I mean is, for example, that release notes should contain the correct instructions for bringing in that specific version.

[pfiaux]

Ah I see, so for example rules_go has some automation/rules to handle that https://github.com/bazelbuild/rules_go/wiki/Release-process. I'm sure other rules also use a similar solution, maybe there's a tool some project shared for that.

So something similar so that when you do a release there's an easy way to generate the text to append/prepend to the release notes when the release is done with gh (I saw that notes can be passed in to gh release https://cli.github.com/manual/gh_release_edit)?