Add yml to build/release using GH Actions

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+#
+# CI build that assembles artifacts and runs tests.
+# If validation is successful this workflow releases from the main dev branch.
+#
+# - skipping CI: add [skip ci] to the commit message
+# - skipping release: add [skip release] to the commit message
+#
+name: CI
+
+on:
+  push:
+    branches: ['release/1.x']
+    tags-ignore: [v*] # release tags are automatically generated after a successful CI build, no need to run CI against them
+  pull_request:
+    branches: ['**']
+
+jobs:
+
+  #
+  # Main build job
+  #
+  build:
+    runs-on: ubuntu-latest
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+
+    # Definition of the build matrix
+    strategy:
+      matrix:
+        java: [8, 11]
+
+    # All build steps
+    # SINGLE-MATRIX-JOB means that the step does not need to be executed on every job in the matrix
+    steps:
+
+      - name: 1. Check out code
+        uses: actions/checkout@v2 # https://github.com/actions/checkout
+        with:
+          fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci
+
+      - name: 2. Set up Java ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+
+      - name: 3. Build on Java ${{ matrix.java }}
+        run: ./gradlew build bintrayUpload --scan -PbintrayDryRun
+
+  #
+  # Release job, only for pushes to the main development branch
+  #
+  release:
+    runs-on: ubuntu-latest
+    needs: [build] # build job must pass before we can release
+
+    if: github.event_name == 'push'
+      && github.ref == 'refs/heads/release/1.x'
+      && github.repository == 'mockito/mockito'
+      && !contains(toJSON(github.event.commits.*.message), '[skip release]')
+
+    steps:
+
+      - name: Check out code
+        uses: actions/checkout@v2 # https://github.com/actions/checkout
+        with:
+          fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci
+
+      - name: Set up Java 8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 8
+
+      - name: Build and publish to Bintray/MavenCentral
+        run: ./gradlew bintrayUpload githubRelease --scan
+        env:
+          MAVEN_CENTRAL_RELEASE: ${{contains(toJSON(github.event.commits.*.message), '[ci maven-central-release]')}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          BINTRAY_API_KEY: ${{secrets.BINTRAY_API_KEY}}
+          NEXUS_TOKEN_USER: ${{secrets.NEXUS_TOKEN_USER}}
+          NEXUS_TOKEN_PWD: ${{secrets.NEXUS_TOKEN_PWD}}