[addendum] Upgrade Gradle and Gradle plugins (#54)

build.gradle

@@ -52,6 +52,12 @@ protobuf {
     generatedFilesBaseDir = "$projectDir/src"
 }
 
+// The processResources task needs to depend on the generateProto task because it uses the output
+// of the the generateProto task
+processResources {
+    dependsOn generateProto
+}
+
 task AdminCommand(type: CreateStartScripts) {
     mainClassName = 'com.scalar.admin.AdminCommand'
     applicationName = 'scalar-admin'
@@ -88,6 +94,14 @@ distTar {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 }
 
+installDist {
+    duplicatesStrategy DuplicatesStrategy.EXCLUDE
+}
+
+sourcesJar {
+    duplicatesStrategy DuplicatesStrategy.EXCLUDE
+}
+
 docker {
     name "${project.name}"
     files tasks.distTar.outputs