Add gha release job

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+name: Build and upload release binary
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup JDK 8
+        uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 8
+          cache: maven
+      - name: Build with Maven
+        run: mvn -B package --file htrace-core4/pom.xml
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: htrace-core4/target/htrace-core4-4.1.0-incubating.jar