Introduce github actions pull request workflow

.github/workflows/pull-request.yml

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+name: Pull request
+on:
+  pull_request:
+    types: [ opened, reopened, synchronize ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ '8', '11', '15' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup java
+        uses: actions/setup-java@v2
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: 'adopt'
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify

.github/workflows/release.yml

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+name: Release
+on: [ workflow_dispatch ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup java
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'adopt'
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Bintray
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'adopt'
+          server-id: bintray
+          server-username: BINTRAY_USER
+          server-password: BINTRAY_PASSWORD
+      - name: Publish release
+        run: bash github-build.sh
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSS_USER_TOKEN_KEY }}
+          MAVEN_PASSWORD: ${{ secrets.OSS_USER_TOKEN_PASS }}

.github/workflows/snapshot.yml

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+name: Release Snapshot
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup java
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'adopt'
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Bintray
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'adopt'
+          server-id: bintray
+          server-username: BINTRAY_USER
+          server-password: BINTRAY_PASSWORD
+      - name: Publish release
+        run: mvn --batch-mode -Pbintray deploy
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSS_USER_TOKEN_KEY }}
+          MAVEN_PASSWORD: ${{ secrets.OSS_USER_TOKEN_PASS }}

github-build.sh

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+#!/bin/bash
+set -ev
+
+getVersion() {
+  grep -m1 -o '[^<>]*-SNAPSHOT' pom.xml
+}
+
+removeSnapshots() {
+  sed -i 's/-SNAPSHOT//' pom.xml
+}
+
+commitRelease() {
+  local APP_VERSION=$(getVersion)
+  git commit -a -m "Update version for release"
+  git tag -a "v${APP_VERSION}" -m "Tag release version"
+}
+
+bumpVersion() {
+  echo "Bump version number"
+  local APP_VERSION=$(getVersion | xargs)
+  local SEMANTIC_REGEX='^([0-9]+)\.([0-9]+)(\.([0-9]+))?$'
+  if [[ ${APP_VERSION} =~ ${SEMANTIC_REGEX} ]]; then
+    if [[ ${BASH_REMATCH[4]} ]]; then
+      nextVersion=$((BASH_REMATCH[4] + 1))
+      nextVersion="${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.${nextVersion}-SNAPSHOT"
+    else
+      nextVersion=$((BASH_REMATCH[2] + 1))
+      nextVersion="${BASH_REMATCH[1]}.${nextVersion}-SNAPSHOT"
+    fi
+
+    echo "Next version: ${nextVersion}"
+      sed -i "'0,/<version>.*<\/version>/s//<version>${nextVersion}<\/version>/'" pom.xml
+
+  else
+    echo "No semantic version and therefore cannot publish to maven repository: '${APP_VERSION}'"
+  fi
+}
+
+commitNextVersion() {
+  git commit -a -m "Update version for release"
+}
+
+git config --global user.email "actions@github.com"
+git config --global user.name "GitHub Actions"
+
+echo "Deploying release to Bintray"
+removeSnapshots
+
+mvn release:clean release:prepare release:perform -B -e -Pbintray
+
+commitRelease
+bumpVersion
+commitNextVersion
+git push --follow-tags