build: Update checkout version and push

Author: a.b.christie

.github/workflows/build.yaml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3
     - name: Set up Docker Buildx
@@ -33,3 +33,4 @@ jobs:
       uses: docker/build-push-action@v6
       with:
         platforms: linux/amd64,linux/arm64
+        push: true