feat: add an alias repo to run the CLI

I can now 'bazel run @aws' to run the CLI in this repo.

Since users call our repository macro (or extension) with a name, we should create a repo of that name.

.github/workflows/release_prep.sh

@@ -12,9 +12,9 @@ git archive --format=tar --prefix=${PREFIX}/ ${TAG} | gzip > $ARCHIVE
 SHA=$(shasum -a 256 $ARCHIVE | awk '{print $1}')
 
 cat << EOF
-## Using Bzlmod with Bazel 6
+## Using Bzlmod with Bazel 6 or greater
 
-1. Enable with \`common --enable_bzlmod\` in \`.bazelrc\`.
+1. (Bazel 6 only) Enable with \`common --enable_bzlmod\` in \`.bazelrc\`.
 2. Add to your \`MODULE.bazel\` file:
 
 \`\`\`starlark

MODULE.bazel

@@ -22,7 +22,7 @@ bazel_dep(name = "container_structure_test", version = "1.16.0", dev_dependency
 
 aws = use_extension("//aws:extensions.bzl", "aws")
 aws.toolchain(aws_cli_version = "2.13.0")
-use_repo(aws, "aws_darwin", "aws_linux-aarch64", "aws_linux-x86_64", "aws_toolchains")
+use_repo(aws, "aws", "aws_darwin", "aws_linux-aarch64", "aws_linux-x86_64", "aws_toolchains")
 
 oci = use_extension(
     "@rules_oci//oci:extensions.bzl",

aws/repositories.bzl

@@ -110,7 +110,8 @@ def _aws_repo_impl(rctx):
 # Generated by aws/repositories.bzl
 load("@aspect_rules_aws//aws:toolchain.bzl", "aws_toolchain")
 aws_toolchain(name = "aws_toolchain", target_tool_path = "{}")
-""".format(target_tool_path)
+alias(name = "aws", actual = "//installed:{}/aws", visibility = ["//visibility:public"])
+""".format(target_tool_path, version_dir)
 
     # Base BUILD file for this repository
     rctx.file("BUILD.bazel", build_content)
@@ -147,6 +148,31 @@ aws_repositories = repository_rule(
     attrs = _ATTRS,
 )
 
+def _aws_alias_impl(rctx):
+    rctx.file("BUILD.bazel", """\
+load("@bazel_skylib//rules:native_binary.bzl", "native_binary")
+
+native_binary(
+    name = "aws",
+    src = select(
+        {{
+            "@bazel_tools//src/conditions:linux_x86_64": "@@{0}_linux-x86_64//:aws",
+            "@bazel_tools//src/conditions:linux_aarch64": "@@{0}_linux-aarch64//:aws",
+            "@bazel_tools//src/conditions:darwin_x86_64": "@@{0}_darwin//:aws",
+            "@bazel_tools//src/conditions:darwin_arm64": "@@{0}_darwin//:aws",
+        }},
+    ),
+    out = "aws",
+    visibility = ["//visibility:public"],
+)
+""".format(rctx.name))
+
+aws_alias = repository_rule(
+    _aws_alias_impl,
+    doc = "Create a repository that provides the AWS CLI aliases for host platforms",
+    attrs = {},
+)
+
 # Wrapper macro around everything above, this is the primary API
 def aws_register_toolchains(name, register = True, **kwargs):
     """Convenience macro for users which does typical setup.
@@ -163,6 +189,7 @@ def aws_register_toolchains(name, register = True, **kwargs):
             Should be True for WORKSPACE users, but false when used under bzlmod extension
         **kwargs: passed to each node_repositories call
     """
+    aws_alias(name = name)
     for platform in PLATFORMS.keys():
         aws_repositories(
             name = name + "_" + platform,