diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f936826..50d6c20 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,12 @@ jobs:
     runs-on: golang-1.25
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        run: |
+          # Manual git checkout — actions/checkout needs Node, which the
+          # alpine golang-1.25 image doesn't have.
+          # Gitea runner doesn't expose a token for clone in the usual
+          # way; for a same-network runner the repo URL is enough.
+          git clone --depth 1 "${{ github.server_url }}/${{ github.repository }}.git" .
 
       - name: Set GOPROXY
         run: |
@@ -64,7 +69,10 @@ jobs:
     runs-on: golang-1.25
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        run: |
+          # Manual git checkout — actions/checkout needs Node, which the
+          # alpine golang-1.25 image doesn't have.
+          git clone --depth 1 "${{ github.server_url }}/${{ github.repository }}.git" .
 
       - name: Set GOPROXY
         run: |