add scripted test for Hydra plugin

sbt/src/sbt-test/plugins/hydra/Hello.scala

@@ -0,0 +1,5 @@
+package example
+
+object Hello extends App {
+  println("Hello!")
+}

sbt/src/sbt-test/plugins/hydra/build.sbt

@@ -0,0 +1,12 @@
+ThisBuild / scalaVersion := "2.12.8"
+
+lazy val check = taskKey[Unit]("")
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "hello",
+    check := {
+      val rs = scalaCompilerBridgeResolvers.value
+      assert(rs.exists(r => r.name == "Triplequote Maven Releases"))
+    }
+  )

sbt/src/sbt-test/plugins/hydra/project/HydraPlugin.scala

@@ -0,0 +1,23 @@
+package sbtmyplugin
+
+import sbt._
+import sbt.Keys._
+
+object HydraPlugin extends AutoPlugin {
+  override def requires: Plugins = plugins.JvmPlugin
+  override def trigger: PluginTrigger = allRequirements
+
+  override lazy val projectSettings = Seq(
+    resolvers += "Triplequote Maven Releases" at "https://repo.triplequote.com/artifactory/libs-release/",
+  ) ++ inConfig(Compile)(compileSettings) ++ inConfig(Test)(compileSettings)
+
+  private lazy val compileSettings: Seq[Def.Setting[_]] = inTask(compile)(compileInputsSettings)
+  
+  private def compileInputsSettings: Seq[Setting[_]] = Seq(
+    scalaCompilerBridgeSource := {
+      ModuleID("com.triplequote", "hydra-bridge_1_0", "2.1.4")
+        .withConfigurations(Some(Configurations.Compile.name))
+        .sources()
+    }
+  )
+}

sbt/src/sbt-test/plugins/hydra/test

@@ -0,0 +1 @@
+> check