move build and testing into docker multi-stage

Author: jisikoff

Dockerfile

@@ -1,5 +1,7 @@
-FROM groovy:jre8-alpine
-
+#
+# Build stage
+#
+FROM groovy:jre8-alpine as builder
 MAINTAINER "Jeremy Isikoff <jeremy+codeclimate-codenarc@cinchfinancial.com>"
 
 USER root
@@ -8,11 +10,41 @@ RUN apk update && \
     apk add ca-certificates wget curl jq && \
     update-ca-certificates
 
+COPY . /usr/src/app
+
+WORKDIR /usr/src/app
+
+RUN ./gradlew clean compileGroovy infra test --info
+
+#
+# Runtime
+#
+FROM groovy:jre8-alpine
+MAINTAINER "Jeremy Isikoff <jeremy+codeclimate-codenarc@cinchfinancial.com>"
+
+USER root
+
+WORKDIR /usr/src/app
+
+# Test and debug depedencies
+COPY --from=builder /usr/src/app/Dockerfile /usr/src/app/Dockerfile
+COPY --from=builder /usr/src/app/engine.json /usr/src/app/engine.json
+COPY --from=builder /usr/src/app/build.gradle /usr/src/app/build.gradle
+COPY --from=builder /usr/src/app/gradle /usr/src/app/gradle
+COPY --from=builder /usr/src/app/gradlew /usr/src/app/gradlew
+COPY --from=builder /usr/src/app/fixtures /usr/src/app/fixtures
+
+# Runtime dependencies
+COPY --from=builder /usr/src/app/src /usr/src/app/src
+COPY --from=builder /usr/src/app/lib /usr/src/app/lib
+COPY --from=builder /usr/src/app/codenarc /usr/src/app/codenarc
+
+
 RUN adduser -u 9000 -D app
 
 VOLUME /code
 WORKDIR /code
-COPY . /usr/src/app
+
 RUN chown -R app:app /usr/src/app
 
 USER app

Makefile

@@ -3,7 +3,6 @@
 IMAGE_NAME ?= codeclimate/codeclimate-codenarc
 
 image:
-	./gradlew clean compileGroovy infra
 	docker build --rm -t $(IMAGE_NAME) .
 
 test: image