Add sources and javadocs jars to published artifacts

JCenter requires these

.github/workflows/publish.yml

@@ -0,0 +1,24 @@
+name: Publish Artifacts
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Publish Artifacts
+      run: ./gradlew api:bintrayUpload client:bintrayUpload -DlibraryVersion=${GITHUB_REF##*/}
+      env:
+        BINTRAY_USER : ${{ secrets.BINTRAY_USER }}
+        BINTRAY_KEY : ${{ secrets.BINTRAY_KEY }}

api/build.gradle

@@ -8,16 +8,28 @@ dependencies {
 }
 
 ext {
-    libraryVersion = '0.2.0'
+    libraryVersion = System.getProperty("libraryVersion")
 }
 
 version = libraryVersion
 group = 'com.theokanning.openai-gpt3-java'
 
+task sourcesJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
 publishing {
     publications {
         ApiPublication(MavenPublication) {
             from components.java
+            artifact sourcesJar
+            artifact javadocJar
             groupId project.group
             artifactId 'api'
             version libraryVersion

build.gradle

@@ -7,7 +7,6 @@ buildscript {
     }
 }
 
-
 allprojects {
     repositories {
         jcenter()

client/build.gradle

@@ -10,16 +10,28 @@ dependencies {
 }
 
 ext {
-    libraryVersion = '0.2.0'
+    libraryVersion = System.getProperty("libraryVersion")
 }
 
 version = libraryVersion
 group = 'com.theokanning.openai-gpt3-java'
 
+task sourcesJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
 publishing {
     publications {
         ClientPublication(MavenPublication) {
             from components.java
+            artifact sourcesJar
+            artifact javadocJar
             groupId project.group
             artifactId 'client'
             version libraryVersion