Bump docker/build-push-action from 2.4.0 to 2.6.1 (#513)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.4.0 to 2.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2.4.0...v2.6.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -86,7 +86,7 @@ jobs:
           fi
 
       - name: Build and push final image
-        uses: docker/build-push-action@v2.4.0
+        uses: docker/build-push-action@v2.6.1
         with:
           platforms: ${{ steps.vars.outputs.platforms }}
           build-args: |