fix(GH actions): remove cosine from docker action

.github/workflows/docker-image.yml

@@ -29,12 +29,6 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
 
-    - name: Install cosign
-      if: github.event_name != 'pull_request'
-      uses: sigstore/cosign-installer@f3c664df7af409cb4873aa5068053ba9d61a57b6 #v2.6.0
-      with:
-        cosign-release: 'v1.11.0'
-
     - name: Setup Docker buildx
       uses: docker/setup-buildx-action@v3
 
@@ -63,10 +57,5 @@ jobs:
         cache-from: type=gha
         cache-to: type=gha,mode=max
 
-    - name: Sign the image with cosign
-      if: github.event_name != 'pull_request'
-      run: |
-      cosign sign --key cosign.key ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:
-
 #    - name: Build the Docker image
 #      run: docker build . --file Dockerfile --tag aria-coffee:$(date +%s)