dockerfile and ci added

.github/workflows/dockerpush.yml

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+name: Push to docker. 
+on: [push] # When pushing to any branch then run this action
+# Env variable
+env:
+  DOCKER_USER: ${{secrets.DOCKER_USER}}
+  DOCKER_PASSWORD: ${{secrets.DOCKER_PASSWORD}}
+  REPO_NAME: ${{secrets.REPO_NAME}}
+jobs:
+  push-image-to-docker-hub:  # job name
+    runs-on: ubuntu-latest  # runner name : (ubuntu latest version) 
+    steps:
+    - uses: actions/checkout@v2 # first action : checkout source code
+    - name: docker login
+      run: | # log into docker hub account
+        docker login -u $DOCKER_USER -p $DOCKER_PASSWORD 
+    - name: Build the Docker image # push The image to the docker hub
+      run: docker build . --file Dockerfile --tag $DOCKER_USER/$REPO_NAME:latest
+    - name: Docker Push
+      run: docker push $DOCKER_USER/$REPO_NAME:latest

Dockerfile

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+FROM node:alpine
+
+RUN apk update
+
+RUN apk add openjdk13 wget
+
+RUN mkdir /lavalink
+
+RUN cd /lavalink && wget https://github.com/freyacodes/Lavalink/raw/master/LavalinkServer/application.yml.example -O application.yml
+
+RUN cd /lavalink && wget https://ci.fredboat.com/repository/download/Lavalink_Build/9447:id/Lavalink.jar
+
+CMD cd /lavalink && java -jar Lavalink.jar