Add GH Actions for publishing release archive

Add workflow that create an archive with JAR file, CHANGELOG.md,
README.md and upload it to GH release. Workflow triggered by GIT tag, in
other cases it is skipped.

Related to #97

Author: ligurio

.github/workflows/publish.yml

@@ -0,0 +1,45 @@
+name: Publishing
+
+on:
+  push:
+    tags: ['*']
+
+jobs:
+  publish-jar-tag:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Setup Java
+      uses: actions/setup-java@v2
+      with:
+        java-version: '12'
+        distribution: 'zulu'
+
+    - name: Setup Clojure tools
+      uses: DeLaGuardo/[email protected]
+      with:
+        cli: 1.10.1.693 # Clojure CLI based on tools.deps
+        lein: 2.9.1     # or use 'latest' to always provision latest version of leiningen
+        boot: 2.8.3     # or use 'latest' to always provision latest version of boot
+
+    - run: lein uberjar
+
+    - run: sudo apt install zip
+
+    - name: Create files to release
+      run: |
+        lein uberjar
+        zip jepsen.tarantool-${{ env.TAG }}.zip
+            target/jepsen.tarantool-${{ env.TAG }}-standalone.jar
+            README.md
+            CHANGELOG.md
+
+    - name: Upload files to release
+      uses: svenstaro/upload-release-action@v2
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        file: ./jepsen.tarantool-${{ env.TAG }}.zip
+        asset_name: jepsen.tarantool-${{ env.TAG }}.zip
+        tag: ${{ github.ref }}