Optimize spiffe-vault container and spiffe-vault-cosign example conta…

…iner

Signed-off-by: Marco Franssen <marco.franssen@philips.com>

Dockerfile

@@ -20,5 +20,4 @@ ENV VAULT_ADDR=
 COPY --from=certs /etc/ssl/certs /etc/ssl/certs
 COPY --from=builder build/bin/spiffe-vault /usr/local/bin/spiffe-vault
 COPY --from=vault-binary bin/vault /usr/local/bin/vault
-COPY --from=gcr.io/projectsigstore/cosign:v1.9.0 /ko-app/cosign /usr/local/bin/cosign
 ENTRYPOINT [ "/usr/local/bin/spiffe-vault" ]

example/spiffe-vault-cosign/Dockerfile

@@ -1,9 +1,5 @@
-FROM gcr.io/projectsigstore/cosign:v1.13.1 as cosign-bin
-
-FROM docker:20.10.21-alpine3.16 as docker-bin
-
-FROM philipssoftware/spiffe-vault:v0.4.0
+FROM philipssoftware/spiffe-vault:v0.5.0
 LABEL maintainer="marco.franssen@philips.com"
 ENV DOCKER_CERT_PATH=/certs/client
-COPY --from=docker-bin /usr/local/bin/docker /usr/local/bin/docker
-COPY --from=cosign-bin /ko-app/cosign /usr/local/bin/cosign
+COPY --from=docker:20.10.21-alpine3.16 /usr/local/bin/docker /usr/local/bin/docker
+COPY --from=gcr.io/projectsigstore/cosign:v1.13.1 /ko-app/cosign /usr/local/bin/cosign