ci: run Gradle publish task on GitHub Actions

recently the publishment from Travis CI is quite unstable,
it makes 4~5 staging registries and sometimes lack necessary files.
when I use a node on Google Cloud the publishment becomes stable,
so hope that using another cloud service solves the problem.

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@722adc6
+      - name: Set up JDK 11
+        uses: actions/setup-java@081536e
+        with:
+          java-version: '8.0.x'
+      - uses: actions/cache@cffae95
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Build
+        run: |
+          echo $GPG_PRIV_KEY > secring.text
+          gpg --import --batch secring.text
+          echo ossrhUsername=eller86 >> gradle.properties
+          echo "ossrhPassword=${SONATYPE_PASSWORD}" >> gradle.properties
+          echo "signing.keyId=${SIGNING_KEY_ID}" >> gradle.properties
+          echo "signing.password=${SIGNING_PASSWORD}" >> gradle.properties
+          ./gradlew publish --no-daemon
+        env:
+          GPG_PRIV_KEY: ${{ secrets.GPG_PRIV_KEY }}
+          SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
+          SIGNING_KEY_ID: ${{ secrets.SIGNING_KEY_ID }}
+          SIGNING_PASSWORD: ${{ secrets.SIGNING_PASSWORD }}

.travis.yml

@@ -111,19 +111,3 @@ deploy:
     on:
       tags: true
       jdk: openjdk8
-  - provider: script
-    skip_cleanup: true
-    # wait until uploading task finishes, because it may cost more than 10 minutes without any output
-    # https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
-    script: .travis/travis_wait "./gradlew publish"
-    on:
-      jdk: openjdk8
-      branch: master
-  - provider: script
-    skip_cleanup: true
-    # wait until uploading task finishes, because it may cost more than 10 minutes without any output
-    # https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
-    script: .travis/travis_wait "./gradlew publish"
-    on:
-      tags: true
-      jdk: openjdk8