Petoss 533 publish java sdk after manual release from GitHub

.github/workflows/publish.yml

@@ -0,0 +1,47 @@
+name: Publish
+on:
+    release:
+        types: [published]
+
+jobs:
+    publish:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout Xero-Java repo
+              uses: actions/checkout@v4
+              with:
+                repository: XeroAPI/Xero-Java
+                path: Xero-Java
+
+            - name: Set up JDK environment
+              uses: actions/setup-java@v4
+              with: 
+                distribution: 'temurin'
+                java-version: '11'
+                cache: maven
+
+            - name: Import GPG Key
+              run: |
+                echo "${{ secrets.GPG_PRIVATE_KEY }}" | gpg --batch --import
+              env: 
+                GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY}}
+
+            - name: Configure Maven settings
+              run: |
+                mkdir -p ~/.m2
+                echo "<settings>
+                        <servers>
+                            <server>
+                              <id>ossrh</id>
+                              <username>${{ secrets.MAVEN_USERNAME }}</username>
+                              <password>${{ secrets.MAVEN_TOKEN }}</password>
+                            </server>
+                          </servers>
+                        </settings>" > ~/.m2/settings.xml
+
+            - name: Publish to Maven
+              run: |
+                export GPG_TTY=$(tty)
+                mvn clean deploy -DskipTests=true -Dgpg.passphrase=${{ secrets.GPG_PASSPHRASE }}
+              working-directory: Xero-Java