Fixes to get cosign working.

generic-tasks/j7s-buildah.yaml

@@ -29,6 +29,7 @@ spec:
       # Login
       buildah login --tls-verify=false --username=$USERNAME --password=$PASSWORD $(params.registry)
       # Setup cosign.
+      mkdir -p ~/.sigstore
       cp /etc/cosign-credentials/* ~/.sigstore
       cat <<EOF > ~/.sigstore/param-file.yaml
       privateKeyFile: "$HOME/.sigstore/cosign.key"
@@ -71,7 +72,6 @@ spec:
   volumes:
   - name: varlibcontainers
     emptyDir: {}
-      volumes:
   - name: cosign-credentials
     secret:
       secretName: $(params.cosign-secret-name)