Add Dockerfiles and update Docs README (#124)

Co-authored-by: Ayush Chaurasia <ayush.chaurarsia@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/docker.yaml

@@ -0,0 +1,57 @@
+# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
+# Builds ultralytics/ultralytics:latest images on DockerHub https://hub.docker.com/r/ultralytics
+
+name: Publish Docker Images
+
+on:
+  push:
+    branches: [ none ]  # TODO: replace with main
+
+jobs:
+  docker:
+    if: github.repository == 'ultralytics/ultralytics'
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push arm64 image
+        uses: docker/build-push-action@v3
+        continue-on-error: true
+        with:
+          context: .
+          platforms: linux/arm64
+          file: docker/Dockerfile-arm64
+          push: true
+          tags: ultralytics/ultralytics:latest-arm64
+
+      - name: Build and push CPU image
+        uses: docker/build-push-action@v3
+        continue-on-error: true
+        with:
+          context: .
+          file: docker/Dockerfile-cpu
+          push: true
+          tags: ultralytics/ultralytics:latest-cpu
+
+      - name: Build and push GPU image
+        uses: docker/build-push-action@v3
+        continue-on-error: true
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: ultralytics/ultralytics:latest