install knex inside of Docker

Dockerfile

@@ -8,7 +8,7 @@ RUN apk add --no-cache make gcc g++ python
 COPY package*.json ./
 
 # Install app dependencies
-RUN npm install --only=production
+RUN npm install --only=production && npm i -g knex
 
 ARG TARGET_ENV
 ENV HOST=0.0.0.0