fix: fixed workflow error

Author: ttionya

.github/workflows/docker-test.yml

@@ -31,16 +31,19 @@ jobs:
         with:
           context: '.'
           file: './Dockerfile'
-          platforms: 'linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7'
           tags: ttionya/vaultwarden-backup:base
+          load: true
+      -
+        name: Test
+        run: docker image ls
       -
         name: Build Test Docker Image
         uses: docker/build-push-action@v5
         with:
           context: '.'
           file: './tests/Dockerfile'
-          platforms: 'linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7'
           tags: ttionya/vaultwarden-backup:test
+          load: true
       -
         name: Test
         run: |