successful docker build

docker/Dockerfile

@@ -3,12 +3,18 @@ FROM ubuntu:18.04
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    curl \
+    gnupg \
     software-properties-common \
     && add-apt-repository universe \
+    && curl -fsSL https://packages.couchbase.com/ubuntu/couchbase.key \
+        | gpg --dearmor -o /usr/share/keyrings/couchbase.gpg \
+    && echo "deb [signed-by=/usr/share/keyrings/couchbase.gpg] https://packages.couchbase.com/ubuntu bionic bionic/main" \
+        > /etc/apt/sources.list.d/couchbase.list \
     && apt-get update && apt-get install -y \
     build-essential \
     cmake \
-    curl \
     libev-dev \
     libjson-c-dev \
     libcouchbase-dev \