Revert "chore: remove checkout in favor of gha caching"

This reverts commit 428ba44cee.

.github/workflows/nightly.yml

@@ -38,6 +38,18 @@ jobs:
     runs-on: depot-ubuntu-24.04-arm
 
     steps:
+      - uses: actions/checkout@v5
+        with:
+          ref: refs/heads/master # force master
+          fetch-depth: 0
+
+      - name: Get dist from cache
+        uses: actions/cache/restore@v4
+        id: cache-dist
+        with:
+          path: dist
+          key: ${{ runner.os }}-${{ github.sha }}-dist
+
       - name: Login
         uses: docker/login-action@v3
         with:
@@ -59,6 +71,7 @@ jobs:
       - name: Publish
         uses: docker/build-push-action@v6
         with:
+          context: .
           platforms: linux/amd64,linux/arm64,linux/arm/v6
           push: true
           tags: ${{ steps.meta.outputs.tags }}