chore(deps): bump docker/build-push-action from 4 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/e2e-test-sign.yml

@@ -34,14 +34,14 @@ jobs:
         uses: actions/checkout@v3
       - name: Build and push to local registry
         id: image1
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: ./tests/e2e
           push: true
           tags: localhost:5000/image1:latest
       - name: Build and push to local registry
         id: image2
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: ./tests/e2e
           push: true

.github/workflows/e2e-test-verify.yml

@@ -34,14 +34,14 @@ jobs:
         uses: actions/checkout@v3
       - name: Build and push to local registry
         id: image1
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: ./tests/e2e
           push: true
           tags: localhost:5000/image1:latest
       - name: Build and push to local registry
         id: image2
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: ./tests/e2e
           push: true