Bump docker/setup-buildx-action from 1.5.1 to 1.6.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v1.5.1...v1.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/push.yml

@@ -15,7 +15,7 @@ jobs:
           echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV
           echo "DOCKER_TAG=$(echo ${GITHUB_REPOSITORY#*/}):$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1.5.1
+        uses: docker/setup-buildx-action@v1.6.0
         with:
           install: true
       - name: Cache Docker layers