github workflow to update docker image

.github/workflows/docker-latest.yml

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+name: Update docker image
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Check Out Repo 
+        uses: actions/checkout@v2
+
+      - name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+        java-version: 1.16
+
+      - name: Assemble Jar
+        run: sbt assembly
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Runner.Dockerfile
+          push: true
+          tags: librecaptcha/lc-core:latest
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

Runner.Dockerfile

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+FROM adoptopenjdk/openjdk16:alpine-jre  AS base-core
+ENV JAVA_HOME="/usr/lib/jvm/default-jvm/"
+RUN apk add --update ttf-dejavu
+ENV PATH=$PATH:${JAVA_HOME}/bin
+
+
+FROM base-core
+WORKDIR /lc-core
+COPY /build/target/scala-2.13/LibreCaptcha.jar .
+RUN mkdir data/
+
+EXPOSE 8888
+
+CMD [ "java", "-jar", "LibreCaptcha.jar" ]