Add github release workflow

Author: I-Al-Istannen

.github/workflows/releases.yaml

@@ -0,0 +1,36 @@
+name: Release JAR
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  JAVA_VERSION: 16
+
+jobs:
+
+  release:
+    name: Build and release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ env.JAVA_VERSION }}
+
+      - uses: actions/checkout@v2
+
+      - name: Build shadow jar
+        run: ./gradlew shadowJar
+
+      - name: Create release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: application/build/libs/TJ-Bot.jar

application/build.gradle

@@ -89,10 +89,6 @@ tasks.generateJooq {
     dependsOn("flywayMigrate")
 }
 
-application {
-    mainClass = "org.togetherjava.tjbot.Application"
-}
-
 shadowJar {
     archiveBaseName.set('TJ-Bot')
     archiveClassifier.set('')