scripts: add sops installation

scripts/setup.sh

@@ -6,6 +6,9 @@ apk add --update --no-cache ca-certificates git openssh ruby curl tar gzip make
 curl --retry 5 -L https://storage.googleapis.com/kubernetes-release/release/${KUBE_VERSION}/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl
 chmod +x /usr/local/bin/kubectl
 
+curl --retry 5 -L https://github.com/mozilla/sops/releases/download/${SOPS_VERSION}/sops-${SOPS_VERSION}.linux -o /usr/local/bin/sops
+chmod +x /usr/local/bin/sops
+
 curl --retry 5 -L https://get.helm.sh/helm-${HELM_VERSION}-linux-amd64.tar.gz | tar zxv -C /tmp
 mv /tmp/linux-amd64/helm /usr/local/bin/helm
 rm -rf /tmp/linux-amd64