Add github action for creating releases (#671)

.github/workflows/release.yml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..e516d59
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,38 @@
+name: Release Binary Package
+on:
+  push:
+    branches:
+      - master
+    pull_request:
+
+jobs:
+  generate:
+    name: Create release-artifacts
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout the sources"
+        uses: actions/checkout@v2.3.1
+      - name: Install JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: "zulu"
+          java-version: "11"
+      - name: Setup Bazelisk
+        uses: bazelbuild/setup-bazelisk@v1
+      - name: Mount bazel cache
+        uses: actions/cache@v2
+        with:
+          path: "/home/runner/.cache/bazel"
+          key: caches-${{ runner.os }}-release
+      - name: Build release artifact
+        run: bazel build //:rules_kotlin_release
+      - name: Create release sha256
+        run: shasum -a 256 bazel-bin/rules_kotlin_release.tgz > bazel-bin/rules_kotlin_release.tgz.sha256
+      - name: Upload release artifact
+        uses: svenstaro/upload-release-action@2.2.1
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: bazel-bin/rules_kotlin_release.*
+          tag: ${{ github.ref }}
+          file_glob: true
+          overwrite: true