install gnupg package

.drone.yml

@@ -28,4 +28,5 @@ matrix:
     - v1.12.2
   HELM_VERSION:
     - v2.11.0
-
+  SOPS_VERSION:
+    - 3.2.0

Dockerfile

@@ -1,13 +1,18 @@
 ARG BASE_IMAGE=google/cloud-sdk:latest
 FROM $BASE_IMAGE
 
-RUN apk add -U --no-cache openssl jq
+RUN apk add -U --no-cache openssl jq gnupg
 
 # download and install kubectl
 ARG KUBECTL_VERSION
 RUN curl -L https://storage.googleapis.com/kubernetes-release/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl -o /usr/bin/kubectl \
 	&& chmod +x /usr/bin/kubectl
 
+# install mozilla sops
+ARG SOPS_VERSION
+RUN curl -L  https://github.com/mozilla/sops/releases/download/$SOPS_VERSION/sops-$SOPS_VERSION.linux -o /usr/bin/sops \
+	&& chmod +x /usr/bin/sops
+
 ARG HELM_VERSION
 RUN curl -LO https://storage.googleapis.com/kubernetes-helm/helm-$HELM_VERSION-linux-amd64.tar.gz \
   && tar xfvz helm-$HELM_VERSION-linux-amd64.tar.gz \