Gradle: Use the docker-remote-api plugin to create a base image to ru…

…n ORT

In constrast to JIB [1], this plugin can build (base) images from a
Dockerfile. The base image uses a slim / "headless" JRE 11 running on Debian
"sid" (unstable) and is otherwise empty for now.

[1] GoogleContainerTools/jib#657 (comment)

Signed-off-by: Sebastian Schuberth <[email protected]>

cli/build.gradle

@@ -1,9 +1,19 @@
+plugins {
+    id 'com.bmuschko.docker-remote-api'
+}
+
 // Apply core plugins.
 apply plugin: 'application'
 
 applicationName = 'ort'
 mainClassName = 'com.here.ort.Main'
 
+task dockerBuildBaseImage(type: com.bmuschko.gradle.docker.tasks.image.DockerBuildImage) {
+    // This task uses 'docker/Dockerfile' as the input file.
+    description = 'Builds the base Docker image to run ORT.'
+    tag = 'ort-base:latest'
+}
+
 repositories {
     jcenter()
 

cli/docker/Dockerfile

@@ -0,0 +1,18 @@
+# Copyright (c) 2017-2018 HERE Europe B.V.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+# License-Filename: LICENSE
+
+FROM openjdk:11-jre-slim-sid

gradle.properties

@@ -1,4 +1,5 @@
 detektPluginVersion = 1.0.0-RC12
+dockerRemoteApiPluginVersion = 4.1.0
 dokkaPluginVersion = 0.9.17
 ideaExtPluginVersion = 0.4.2
 kotlinPluginVersion = 1.3.11