remove broken docker image upload

Author: syphar

.github/workflows/docker.yml

@@ -11,13 +11,3 @@ jobs:
 
       - name: Build the Docker image
         run: docker build -t docs-rs -f dockerfiles/Dockerfile .
-
-      - name: Upload the Docker image to ECR
-        uses: rust-lang/simpleinfra/github-actions/upload-docker-image@master
-        with:
-          image: docs-rs
-          repository: staging-docs-rs
-          region: us-west-1
-          aws_access_key_id: "${{ secrets.aws_access_key_id }}"
-          aws_secret_access_key: "${{ secrets.aws_secret_access_key }}"
-        if: ${{ github.ref == 'refs/heads/master' && github.repository_owner == 'rust-lang' }}