ci(docker-sign): remove signing docker image

.goreleaser.yml

@@ -95,14 +95,3 @@ signs:
       - "--yes" # needed on cosign 2.0.0+
     artifacts: checksum
     output: true
-# signs our docker image
-# https://goreleaser.com/customization/docker_sign
-docker_signs:
-  - cmd: cosign
-    env:
-      - COSIGN_EXPERIMENTAL=1
-    output: true
-    args:
-      - "sign"
-      - "${artifact}"
-      - "--yes" # needed on cosign 2.0.0+