try that

README.md

@@ -22,8 +22,6 @@
 
 </table>
 
-🔢 Lets you pick a specific version of Git to use (if needed) \
-⚡ Defaults to using the system version of Git \
 📂 Lets you add additional [safe directories] \
 🔑 Configures Git to use `github.token` when pushing/pulling from `github.server_url` \
 👤 Sets up <b>@github-actions\[bot\]</b> as the default Git author
@@ -32,6 +30,8 @@
 
 ![GitHub Actions](https://img.shields.io/static/v1?style=for-the-badge&message=GitHub+Actions&color=2088FF&logo=GitHub+Actions&logoColor=FFFFFF&label=)
 
+**🚀 Here's what you want:**
+
 ```yml
 on: push
 jobs:
@@ -45,3 +45,13 @@ jobs:
       - run: git commit --message 'Prettier' # ✅
       - run: git push # ✅
 ```
+
+### Inputs
+
+⚠️ Support for choosing a `git-version` is not yet implemented. Contributions are welcome! ❤️
+
+### Outputs
+
+<!-- prettier-ignore-start -->
+[safe directories]: https://git-scm.com/docs/git-config/2.35.2#Documentation/git-config.txt-safedirectory
+<!-- prettier-ignore-end -->

action.yml

@@ -6,13 +6,20 @@ branding:
   color: orange
 
 inputs:
-  token:
+  github-token:
     default: ${{ github.token }}
-  git-version: {}
+  github-server-url:
+    default: ${{ github.server_url }}
+  # gitlab-token: {}
+  # gitlab-server-url: {}
+  # bitbucket-token: {}
+  # bitbucket-server-url: {}
   user:
     default: github-actions[bot]
   user-name: {}
   user-email: {}
+  safe-directory:
+    default: .
 
 runs:
   using: node20

src/main.ts

@@ -1,6 +1,8 @@
+import assert from "node:assert/strict";
 import { $ } from "execa";
 import * as core from "@actions/core";
-import assert from "node:assert/strict";
+import * as tc from "@actions/tool-cache";
+import { glob } from "glob";
 
 const githubContext = {
   actor: process.env.GITHUB_ACTOR!,
@@ -47,17 +49,24 @@ function getNameEmailInput(
   return [name, email];
 }
 
-const version = core.getInput("git-version");
-
+const githubToken = core.getInput("github-token");
+const githubServerURL = core.getInput("github-server-url");
 const [userName, userEmail] = getNameEmailInput("user");
+const safeDirectoryGlobs = core.getMultilineInput("safe-directory");
+const safeDirectories = await glob(safeDirectoryGlobs);
 
 if (userName && userEmail) {
   await $({ stdio: "inherit" })`git config --global user.name ${userName}`;
   await $({ stdio: "inherit" })`git config --global user.email ${userEmail}`;
 }
 
-const prefix = new URL(githubContext.server_url).origin + "/";
-const githubToken = core.getInput("token");
+const prefix = new URL(githubServerURL).origin + "/";
 await $({
   stdio: "inherit",
 })`git config --global http.${prefix}.extraheader ${`AUTHORIZATION: basic ${githubToken}`}`;
+
+for (const safeDirectory of safeDirectories) {
+  await $({
+    stdio: "inherit",
+  })`git config --global --add safe.directory ${safeDirectory}`;
+}