[Java] Explore maven publishing, sonatype and alternatives (#209)

* Update gradle.properties

* Create publishing.yml

* Update gradle.properties

* Update publishing.yml

* Update publishing.yml

.github/workflows/publishing.yml

@@ -0,0 +1,35 @@
+name: Publish the Java SDK
+on:
+  workflow_dispatch:
+    inputs:
+      deploy:
+        description: 'Deploy?'
+        required: true
+        type: boolean
+jobs:
+  build:
+    name: Build and Test
+    if:  ${{ inputs.deploy }} 
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 8
+        uses: actions/setup-java@v3
+        with:
+          java-version: '8'
+          distribution: 'corretto'
+
+      - name: Build and Test with Gradle
+        run: ./gradlew build
+
+      - name: Publish SDK Library to Maven Central
+        run: ./gradlew publishAllPublicationsToMavenCentralRepository --no-configuration-cache
+        env:
+          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.MAVEN_USERNAME }}
+          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.MAVEN_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.GPG_KEY }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyId: ${{ secrets.GPG_KEY_ID }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.GPG_KEY_PASSWORD }}

gradle.properties

@@ -30,10 +30,5 @@ POM_LICENCE_DIST=repo
 
 POM_DEVELOPER_NAME=Countly
 
-#SIGNING SECTION
-signing.keyId=xx
-signing.password=xx
-signing.secretKeyRingFile=xx
-
-mavenCentralUsername=xx
-mavenCentralPassword=xx
+# Publishing properties
+SONATYPE_AUTOMATIC_RELEASE=true