build: Add support for signing. (#9)

Author: kinyoklion

.circleci/config.yml

@@ -93,4 +93,4 @@ jobs:
           command: ./gradlew javadoc checkstyleMain
       - run:
           name: Publish to local maven
-          command: ./gradlew publishToMavenLocal
+          command: ./gradlew publishToMavenLocal -P LD_SKIP_SIGNING=1

build.gradle

@@ -43,7 +43,7 @@ checkstyle {
 
 publishing {
     publications {
-        mavenJava(MavenPublication) { publication ->
+        mavenJava(MavenPublication) {
             from components.java
 
             artifactId = 'launchdarkly-openfeature-serverprovider'
@@ -80,6 +80,19 @@ publishing {
     }
 }
 
+signing {
+    sign publishing.publications.mavenJava
+}
+
+tasks.withType(Sign) { t ->
+    onlyIf { !shouldSkipSigning() } // so we can build jars for testing in CI
+}
+
+def shouldSkipSigning() {
+    return "1".equals(project.findProperty("LD_SKIP_SIGNING")) ||
+            "1".equals(System.getenv("LD_SKIP_SIGNING"))
+}
+
 nexusPublishing {
     clientTimeout = java.time.Duration.ofMinutes(2) // we've seen extremely long delays in creating repositories
     repositories {