Setup simple Github workflow

Author: floscher

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Create releases
+on:
+    push:
+        tags:
+            - v*
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        container: registry.gitlab.com/josm/docker-library/openjdk-8-josmplugin:latest
+        steps:
+            - uses: actions/checkout@v2.3.4
+            - run: ./gradlew dist
+            - name: Release to GitHub
+              id: release_to_github
+              uses: actions/create-release@v1.1.4
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  tag_name: ${{ github.ref }}
+                  release_name: Release ${{ github.ref }}
+                  draft: false
+                  prerelease: false
+            - name: Add file to release
+              id: add_file_to_release
+              uses: actions/upload-release-asset@v1.0.2
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  upload_url: ${{ steps.release_to_github.outputs.upload_url }}
+                  asset_path: ./build/dist/pt_assistant.jar
+                  asset_name: pt_assistant.jar
+                  asset_content_type: application/java-archive