Add Dockerfile, Drone CI config, fix main class

.drone.yml

@@ -0,0 +1,28 @@
+kind: pipeline
+type: exec
+name: build-and-deploy
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: build-backend
+    commands:
+      - source /root/.sdkman/bin/sdkman-init.sh
+      - sdk use java 8.0.432-amzn
+      - cd jshERP-boot
+      - mvn package -DskipTests
+
+  - name: build-frontend
+    commands:
+      - cd jshERP-web
+      - npm install --legacy-peer-deps
+      - npx vue-cli-service build
+
+  - name: docker-build-deploy
+    commands:
+      - docker build -t jsherp:latest .
+      - docker stop jsherp || true
+      - docker rm jsherp || true
+      - docker run -d --name jsherp --network host -v /opt/jshERP/upload:/opt/jshERP/upload --restart unless-stopped jsherp:latest