Added GitHub workflow to push to Docker Hub

.github/workflows/docker.yml

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+name: docker
+
+on:
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Add SHORT_SHA environment variable
+        run: echo "SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`" >> $GITHUB_ENV
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./docker/ludwig-ray/Dockerfile
+          push: true
+          tags:
+            - ludwigai/ludwig-ray:latest
+            - ludwigai/ludwig-ray:${SHORT_SHA}

docker/ludwig-ray/Dockerfile

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+#
+# Ludwig Docker image with Ray nightly support and full dependencies including:
+#   text features
+#   image features
+#   audio features
+#   visualizations
+#   hyperparameter optimization
+#   distributed training
+#   model serving
+#
+
+FROM rayproject/ray:nightly
+
+RUN sudo apt-get update && DEBIAN_FRONTEND="noninteractive" sudo apt-get install -y \
+	wget \
+	build-essential \
+	git \
+	curl \
+	libsndfile1 \
+	cmake \
+	tzdata \
+	rsync \
+	vim
+
+WORKDIR /ludwig
+
+COPY . .
+RUN HOROVOD_GPU_OPERATIONS=NCCL \
+    HOROVOD_WITH_TENSORFLOW=1 \
+    HOROVOD_WITHOUT_MPI=1 \
+    HOROVOD_WITHOUT_PYTORCH=1 \
+    HOROVOD_WITHOUT_MXNET=1 \
+    pip install --no-cache-dir '.[full]'