ghactions: bump docker/build-push-action from 2.10.0 to 3

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.10.0 to 3.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@ac9327e...e551b19)

---
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/backup-operator-docker.yml

@@ -45,7 +45,7 @@ jobs:
         uses: docker/metadata-action@e5622373a38e60fb6d795a4421e56882f2d7a681
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-      - uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
+      - uses: docker/build-push-action@e551b19e49efd4e98792db7592c17c09b89db8d8
         with:
           context: .
           push: true

.github/workflows/publish.yml

@@ -27,7 +27,7 @@ jobs:
         uses: docker/metadata-action@e5622373a38e60fb6d795a4421e56882f2d7a681
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-      - uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
+      - uses: docker/build-push-action@e551b19e49efd4e98792db7592c17c09b89db8d8
         with:
           context: .
           push: true