Remove cosign from build

Author: germanoeich

.github/workflows/docker-publish-tags.yml

@@ -34,15 +34,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
 
-      # Install the cosign tool except on PR
-      # https://github.com/sigstore/cosign-installer
-      - name: Install cosign
-        if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@1e95c1de343b5b0c23352d6417ee3e48d5bcd422
-        with:
-          cosign-release: 'v1.4.0'
-
-
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
         uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf