remove unnecessary COSIGN_PASSWORD (#572)

Signed-off-by: Jake Sanders <[email protected]>

Author: Jake Sanders

.goreleaser.yml

@@ -96,7 +96,6 @@ signs:
     cmd: ./dist/cosign-linux-amd64
     args: ["sign-blob", "-output", "${artifact}.sig", "-key", "gcpkms://projects/{{ .Env.PROJECT_ID }}/locations/{{ .Env.KEY_LOCATION }}/keyRings/{{ .Env.KEY_RING }}/cryptoKeys/{{ .Env.KEY_NAME }}/versions/{{ .Env.KEY_VERSION }}", "${artifact}"]
     artifacts: binary
-    stdin: "{{ .Env.COSIGN_PASSWORD }}"
 
 archives:
 - format: binary