Introduce staged build and build argument (#39)

Dockerfile

@@ -11,13 +11,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-FROM prestosql/presto:347
 ARG PRESTO_VERSION
 
+FROM debian:buster-slim AS builder
+ARG PRESTO_VERSION
+
+RUN apt update && \
+    apt -y install wget unzip
+
+RUN wget -c https://github.com/IBM/presto-db2/releases/download/${PRESTO_VERSION}/presto-db2-${PRESTO_VERSION}.zip
+RUN unzip presto-db2-$PRESTO_VERSION.zip && rm -f presto-db2-$PRESTO_VERSION.zip
+
+
+FROM prestosql/presto:$PRESTO_VERSION
+
 USER root
 # Update centos packages
-RUN dnf update -y
+# RUN dnf upgrade -y && dnf autoremove
 
 USER presto:presto
 # Add Db2 connector
-COPY --chown=presto:presto presto-db2-${PRESTO_VERSION} /usr/lib/presto/plugin/db2
+COPY --from=builder --chown=presto:presto presto-db2-* /usr/lib/presto/plugin/db2

README.md

@@ -7,6 +7,14 @@ This is a docker image for [PrestoDB](https://prestosql.io/) with [Db2 connector
 
 **Notice**: it starts to switch the base image from openjdk to the official prestosql container image [`prestosql/presto`](https://hub.docker.com/r/prestosql/presto) since tag `325`.
 
+## Build
+
+Run this command to build an image with prestodb release 347 and Db2 connector:
+
+```SHELL
+docker build --build-arg PRESTO_VERSION=347 -t "shawnzhu/prestodb:347" .
+```
+
 ## Start
 
 ```SHELL