Added gem publishing workflow

.github/workflows/gem-push.yml

@@ -0,0 +1,36 @@
+name: Ruby Gem
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    name: Build + Publish
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    strategy:
+      matrix:
+        type:
+          - jdbc
+          - mysql
+          - postgresql
+          - redshift
+          - sqlserver
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby 2.7
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+      - name: push gem
+        uses: t3t5u/push-gem-to-gpr-action@v1
+        with:
+          language: java
+          gem-path: "embulk-output-${{ matrix.type }}/build/gems/*.gem"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          gradle-subproject: "embulk-output-${{ matrix.type }}"

build.gradle

@@ -7,6 +7,7 @@ plugins {
     id "signing"
     id 'checkstyle'
     id "org.embulk.embulk-plugins" version "0.6.2" apply false
+    id "com.palantir.git-version" version "3.0.0"
 }
 
 allprojects {
@@ -15,11 +16,16 @@ allprojects {
     description = "Inserts or updates records to a table."
 }
 
+ext {
+    troccoVersion = "0.0.1"
+}
+
 subprojects {
     apply plugin: 'java'
     apply plugin: "maven-publish"
     apply plugin: "signing"
     apply plugin: "org.embulk.embulk-plugins"
+    apply plugin: 'com.palantir.git-version'
     //apply plugin: 'jacoco'
 
     repositories {
@@ -106,6 +112,7 @@ subprojects {
         summary = "JDBC output plugin for Embulk"
         homepage = "https://github.com/embulk/embulk-output-jdbc"
         licenses = [ "Apache-2.0" ]
+        archiveVersion = "${project.version}.trocco.${project.troccoVersion}"
 
         into("default_jdbc_driver") {
             from configurations.defaultJdbcDriver