ci: fix docker deployment (#7402)

.github/workflows/docker.yml

@@ -15,10 +15,18 @@ jobs:
       - name: Get current date
         id: date
         run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Publish to Docker Hub
         uses: docker/build-push-action@v2
         with:
-          repository: interchainio/simapp
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-          tags: nightly-${{ steps.date.outputs.date }}
+          push: true
+          tags: interchainio/simapp:nightly-${{ steps.date.outputs.date }}