docs: add use_default_shell_env to docstring of run_binary (#778)

diff --git a/docs/run_binary.md b/docs/run_binary.md
index 97e2585..185f5a4 100644
--- a/docs/run_binary.md
+++ b/docs/run_binary.md
@@ -11,7 +11,7 @@
 
 <pre>
 run_binary(<a href="#run_binary-name">name</a>, <a href="#run_binary-tool">tool</a>, <a href="#run_binary-srcs">srcs</a>, <a href="#run_binary-args">args</a>, <a href="#run_binary-env">env</a>, <a href="#run_binary-outs">outs</a>, <a href="#run_binary-out_dirs">out_dirs</a>, <a href="#run_binary-mnemonic">mnemonic</a>, <a href="#run_binary-progress_message">progress_message</a>,
-           <a href="#run_binary-execution_requirements">execution_requirements</a>, <a href="#run_binary-stamp">stamp</a>, <a href="#run_binary-kwargs">kwargs</a>)
+           <a href="#run_binary-execution_requirements">execution_requirements</a>, <a href="#run_binary-use_default_shell_env">use_default_shell_env</a>, <a href="#run_binary-stamp">stamp</a>, <a href="#run_binary-kwargs">kwargs</a>)
 </pre>
 
 Runs a binary as a build action.
@@ -34,6 +34,7 @@
 | <a id="run_binary-mnemonic"></a>mnemonic |  A one-word description of the action, for example, CppCompile or GoLink.   |  <code>"RunBinary"</code> |
 | <a id="run_binary-progress_message"></a>progress_message |  Progress message to show to the user during the build, for example, "Compiling foo.cc to create foo.o". The message may contain %{label}, %{input}, or %{output} patterns, which are substituted with label string, first input, or output's path, respectively. Prefer to use patterns instead of static strings, because the former are more efficient.   |  <code>None</code> |
 | <a id="run_binary-execution_requirements"></a>execution_requirements |  Information for scheduling the action.<br><br>For example,<br><br><pre><code> execution_requirements = {     "no-cache": "1", }, </code></pre><br><br>See https://docs.bazel.build/versions/main/be/common-definitions.html#common.tags for useful keys.   |  <code>None</code> |
+| <a id="run_binary-use_default_shell_env"></a>use_default_shell_env |  Passed to the underlying ctx.actions.run.<br><br>See https://bazel.build/rules/lib/builtins/actions#run for more details.   |  <code>False</code> |
 | <a id="run_binary-stamp"></a>stamp |  Whether to include build status files as inputs to the tool. Possible values:<br><br>- <code>stamp = 0</code> (default): Never include build status files as inputs to the tool.     This gives good build result caching.     Most tools don't use the status files, so including them in <code>--stamp</code> builds makes those     builds have many needless cache misses.     (Note: this default is different from most rules with an integer-typed <code>stamp</code> attribute.) - <code>stamp = 1</code>: Always include build status files as inputs to the tool, even in     [--nostamp](https://docs.bazel.build/versions/main/user-manual.html#flag--stamp) builds.     This setting should be avoided, since it is non-deterministic.     It potentially causes remote cache misses for the target and     any downstream actions that depend on the result. - <code>stamp = -1</code>: Inclusion of build status files as inputs is controlled by the     [--[no]stamp](https://docs.bazel.build/versions/main/user-manual.html#flag--stamp) flag.     Stamped targets are not rebuilt unless their dependencies change.<br><br>When stamping is enabled, an additional two environment variables will be set for the action:     - <code>BAZEL_STABLE_STATUS_FILE</code>     - <code>BAZEL_VOLATILE_STATUS_FILE</code><br><br>These files can be read and parsed by the action, for example to pass some values to a linker.   |  <code>0</code> |
 | <a id="run_binary-kwargs"></a>kwargs |  Additional arguments   |  none |
 
diff --git a/lib/private/run_binary.bzl b/lib/private/run_binary.bzl
index 1538897..61fd4ab 100644
--- a/lib/private/run_binary.bzl
+++ b/lib/private/run_binary.bzl
@@ -115,6 +115,7 @@
         mnemonic = "RunBinary",
         progress_message = None,
         execution_requirements = None,
+        use_default_shell_env = False,
         stamp = 0,
         **kwargs):
     """Runs a binary as a build action.
@@ -180,6 +181,10 @@
 
             See https://docs.bazel.build/versions/main/be/common-definitions.html#common.tags for useful keys.
 
+        use_default_shell_env: Passed to the underlying ctx.actions.run.
+
+            See https://bazel.build/rules/lib/builtins/actions#run for more details.
+
         stamp: Whether to include build status files as inputs to the tool. Possible values:
 
             - `stamp = 0` (default): Never include build status files as inputs to the tool.
@@ -215,6 +220,7 @@
         mnemonic = mnemonic,
         progress_message = progress_message,
         execution_requirements = execution_requirements,
+        use_default_shell_env = use_default_shell_env,
         stamp = stamp,
         **kwargs
     )