actions) add gitea-compatible checkout action

README.md

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+# actions/checkout
+
+A lightweight checkout action for Gitea Actions, including support for Gitea instances served from a URL subpath (for example `https://host/git`).
+
+## Usage
+
+```yaml
+- name: Checkout
+  uses: https://git.campbellwireless.net/actions/checkout@v1
+  with:
+    server-url: https://cloud.campbellwireless.net/git
+```
+
+## Inputs
+
+- `server-url` (required): base server URL. Include subpath if your Gitea is not at root.
+- `repository` (optional): `owner/name`, defaults to `${{ github.repository }}`.
+- `ref` (optional): branch/tag/SHA, defaults to `${{ github.sha }}`.
+- `token` (optional): auth token, defaults to `${{ secrets.GITHUB_TOKEN }}`.
+- `path` (optional): checkout destination under workspace, defaults to `.`.
+- `fetch-depth` (optional): number of commits to fetch, defaults to `1`; set `0` for full history.
+
+## Output
+
+- `commit`: checked out commit SHA.