Create github actions for maven central publish (#84)

.github/workflows/maven-publish.yml

@@ -0,0 +1,48 @@
+# This workflow will build a package using Maven and then publish it to maven central when a release is created
+# For more information see: https://github.com/actions/setup-java/blob/main/docs/advanced-usage.md#apache-maven-with-a-settings-path
+
+name: Publish to Sonatype
+
+on:
+  pull_request:
+    types: [closed]
+  release:
+    types: [created]
+  workflow_dispatch:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: 'li-1.21.0'
+        fetch-depth: 0
+
+    - name: Set up JDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+        server-id: ossrh # Value of the distributionManagement/repository/id field of the pom.xml
+
+    - name: Import GPG key
+      id: import_gpg
+      uses: crazy-max/ghaction-import-gpg@v5
+      with:
+        gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+        passphrase: ${{ secrets.GPG_PASSWD }}
+
+    - name: Publish to GitHub Packages Apache Maven
+      run:  |
+        chmod +x .lipublish/publish.sh
+        .lipublish/publish.sh
+      env:
+        SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
+        SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
+        GPG_PASSWD: ${{ secrets.GPG_PASSWD }}