Merge pull request #36 from concourse/bionic-base-image

switch to using ubuntu:bionic as base image

README.md

@@ -153,10 +153,11 @@ environment is consistent across any `docker` enabled platform. When the docker
 image builds, the test are run inside the docker container, on failure they
 will stop the build.
 
-Run the tests with the following command:
+Run the tests with the following commands for both `alpine` and `ubuntu` images:
 
 ```sh
-docker build -t time-resource .
+docker build -t time-resource -f dockerfiles/alpine/Dockerfile .
+docker build -t time-resource -f dockerfiles/ubuntu/Dockerfile .
 ```
 
 ### Contributing

dockerfiles/ubuntu/Dockerfile

@@ -0,0 +1,24 @@
+FROM concourse/golang-builder AS builder
+COPY . /go/src/github.com/concourse/time-resource
+ENV CGO_ENABLED 0
+ENV GOPATH /go/src/github.com/concourse/time-resource/Godeps/_workspace:${GOPATH}
+ENV PATH /go/src/github.com/concourse/time-resource/Godeps/_workspace/bin:${PATH}
+RUN go build -o /assets/out github.com/concourse/time-resource/out
+RUN go build -o /assets/in github.com/concourse/time-resource/in
+RUN go build -o /assets/check github.com/concourse/time-resource/check
+RUN set -e; for pkg in $(go list ./...); do \
+		go test -o "/tests/$(basename $pkg).test" -c $pkg; \
+	done
+
+FROM ubuntu:bionic AS resource
+RUN apt-get update && apt-get install -y --no-install-recommends tzdata \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /assets /opt/resource
+
+FROM resource AS tests
+COPY --from=builder /tests /tests
+RUN set -e; for test in /tests/*.test; do \
+		$test; \
+	done
+
+FROM resource