add workflow for packages publication

.github/workflows/packages_publishing.yml

@@ -0,0 +1,24 @@
+
+name: Publish package to GitHub Packages
+on: [push]
+jobs:
+  publishing:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Rewrite version
+        run: |
+          branch="`echo "${{ github.ref }}" | grep -o "[^/]*$"`"
+          cat gradle.properties | sed -e "s/^library_version=\([0-9\.]*\)/library_version=\1-branch_$branch-build${{ github.run_number }}/" > gradle.properties.tmp
+          rm gradle.properties
+          mv gradle.properties.tmp gradle.properties
+      - name: Build and publish
+        run: ./gradlew clean build publishAllPublicationsToGithubPackagesRepository -x signJsPublication -x signJvmPublication -x signKotlinMultiplatformPublication -x signMetadataPublication
+        env:
+          GITHUBPACKAGES_USER: ${{ github.actor }}
+          GITHUBPACKAGES_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
+          SONATYPE_USER: "plug"
+          SONATYPE_PASSWORD: "plug"