Modify gradle files to allow for local publishing

... as we're currently not using CI to publish the packages.

Author: tnull

bindings/kotlin/ldk-node-android/lib/build.gradle.kts

@@ -100,9 +100,9 @@ afterEvaluate {
 }
 
 signing {
-    val signingKeyId: String? by project
-    val signingKey: String? by project
-    val signingPassword: String? by project
-    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
+//    val signingKeyId: String? by project
+//    val signingKey: String? by project
+//    val signingPassword: String? by project
+//    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
     sign(publishing.publications)
 }

bindings/kotlin/ldk-node-jvm/lib/build.gradle.kts

@@ -19,6 +19,11 @@ repositories {
     mavenCentral()
 }
 
+java {
+    withSourcesJar()
+    withJavadocJar()
+}
+
 dependencies {
     // Use the Kotlin JUnit 5 integration.
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
@@ -100,9 +105,9 @@ afterEvaluate {
 }
 
 signing {
-    val signingKeyId: String? by project
-    val signingKey: String? by project
-    val signingPassword: String? by project
-    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
+//    val signingKeyId: String? by project
+//    val signingKey: String? by project
+//    val signingPassword: String? by project
+//    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
     sign(publishing.publications)
 }