Add publish GitHub action

.github/workflows/publish.yaml

@@ -0,0 +1,36 @@
+name: publish
+
+on: [ push ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/cache@v1
+        with:
+          path: ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.*') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-wrapper-
+
+      - uses: actions/cache@v1
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/*.gradle.kts') }}-${{ hashFiles('buildSrc/src/main/kotlin/Versions.kt') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-caches-
+
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - run: ./gradlew publish
+        env:
+          ORG_GRADLE_PROJECT_ossrhUsername: ${{ secrets.OSSRH_USERNAME }}
+          ORG_GRADLE_PROJECT_ossrhPassword: ${{ secrets.OSSRH_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingKeyId: ${{ secrets.SIGNING_KEY_ID }}
+          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.SIGNING_KEY }}
+          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.SIGNING_PASSWORD }}