Drop deprecated use of npm install --production=false (#2298)

.buildkite/Dockerfile

@@ -11,6 +11,6 @@ RUN apt-get clean -y && \
 WORKDIR /usr/src/app
 
 COPY package.json .
-RUN npm install --production=false
+RUN npm install
 
 COPY . .

.buildkite/Dockerfile-make

@@ -24,7 +24,7 @@ USER ${BUILDER_UID}:${BUILDER_GID}
 
 # install dependencies
 COPY package.json .
-RUN npm install --production=false
+RUN npm install
 
 # copy project files
 COPY . .