Add docker build workflow

.github/workflows/docker.yml

@@ -0,0 +1,60 @@
+name: Create and publish docker image
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Workaround: https://github.com/docker/build-push-action/issues/461
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v2.0.0
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into GitHub Container registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2.0.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Log into Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2.0.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Generate image name
+        run: |
+          echo "IMAGE_NAME=${GITHUB_REPOSITORY,,}" >>${GITHUB_ENV}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v3.1.1
+        with:
+          file: deployment/Dockerfile
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: |
+            ghcr.io/${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:latest

README.md

@@ -1,6 +1,7 @@
 ## 🐾 Tabby
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+![Docker build status](https://img.shields.io/github/actions/workflow/status/TabbyML/tabby/docker.yml?label=docker%20image%20build)
 
 > **Warning**
 > This repository is undering heavy construction, everything changes fast.