Add action.yml

action.yml

@@ -0,0 +1,25 @@
+name: checkout
+description: Node-free checkout for Gitea Actions using preinstalled git.
+inputs:
+  ref:
+    description: Branch, tag, or commit to fetch (defaults to current workflow commit)
+    required: false
+    default: ""
+runs:
+  using: composite
+  steps:
+    - shell: sh
+      env:
+        TOKEN: ${{ github.token }}
+        REPO:  ${{ github.repository }}
+        REF:   ${{ inputs.ref || github.sha }}
+        SERVER_URL: ${{ github.server_url }}
+      run: |
+        set -euo pipefail
+        BASE="${SERVER_URL:-${GITEA_SERVER_URL:-}}"
+        [ -n "$BASE" ] || { echo "Missing server_url"; exit 1; }
+        git init "$GITHUB_WORKSPACE"
+        cd "$GITHUB_WORKSPACE"
+        git remote add origin "${BASE%/}/${REPO}.git"
+        git -c http.extraHeader="Authorization: token $TOKEN" fetch --depth=1 origin "$REF"
+        git checkout FETCH_HEAD