Use dependabot to update docker images in tests

Author: prdoyle

.github/dependabot.yml

@@ -1,15 +1,18 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
-  - package-ecosystem: "gradle" # See documentation for possible values
-    directory: "/" # Location of package manifests
+  - package-ecosystem: "gradle"
+    directory: "/"
     schedule:
       interval: "weekly"
     groups:
-      dependencies:
+      gradle-deps:
+        patterns:
+          - "*"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      dockerfiles:
         patterns:
           - "*"

bosk-mongo/src/test/java/works/bosk/drivers/mongo/internal/MongoService.java

@@ -10,12 +10,14 @@
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
+import java.nio.file.Paths;
 import java.util.Map;
 import org.jetbrains.annotations.NotNull;
 import org.junit.jupiter.api.TestInfo;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.testcontainers.containers.Network;
+import org.testcontainers.images.builder.ImageFromDockerfile;
 import org.testcontainers.mongodb.MongoDBContainer;
 import org.testcontainers.toxiproxy.ToxiproxyContainer;
 import org.testcontainers.utility.DockerImageName;
@@ -41,8 +43,6 @@ public class MongoService implements Closeable {
 	// We do logging in some static initializers, so this needs to be initialized first
 	private static final Logger LOGGER = LoggerFactory.getLogger(MongoService.class);
 
-	private static final DockerImageName MONGODB_IMAGE_NAME = DockerImageName.parse("mongo:8.0");
-
 	private final MongoClient mongoClient = MongoClients.create(normalClientSettings);
 
 	// Expensive stuff shared among instances as much as possible, hence static
@@ -113,18 +113,28 @@ private static MongoDBContainer mongoContainer() {
 	 * @return just the {@link MongoDBContainer} with no options, and not yet started
 	 */
 	static MongoDBContainer newPlainMongoContainer() {
-		return new MongoDBContainer(MONGODB_IMAGE_NAME);
+		return new MongoDBContainer(newContainerFromDockerfile(
+			"mongo",
+			"src/test/resources/mongo.dockerfile")
+		);
 	}
 
 	private static ToxiproxyContainer toxiproxyContainer() {
 		ToxiproxyContainer result = new ToxiproxyContainer(
-			DockerImageName.parse("ghcr.io/shopify/toxiproxy:2.12.0")
-				.asCompatibleSubstituteFor("shopify/toxiproxy"))
-			.withNetwork(NETWORK);
+			newContainerFromDockerfile(
+				"shopify/toxiproxy",
+				"src/test/resources/toxiproxy.dockerfile")
+		).withNetwork(NETWORK);
 		result.start();
 		return result;
 	}
 
+	private static DockerImageName newContainerFromDockerfile(String otherImageName, String filePath) {
+		return DockerImageName.parse(new ImageFromDockerfile()
+			.withDockerfile(Paths.get(filePath)).get()
+		).asCompatibleSubstituteFor(otherImageName);
+	}
+
 	private static ToxiproxyClient createToxiproxyClient() {
 		return new ToxiproxyClient(
 			TOXIPROXY_CONTAINER.getHost(),

bosk-mongo/src/test/resources/mongo.dockerfile

@@ -0,0 +1 @@
+FROM mongo:8.0

bosk-mongo/src/test/resources/toxiproxy.dockerfile

@@ -0,0 +1 @@
+FROM ghcr.io/shopify/toxiproxy:2.12.0