Add Docker Hub publish action (#73)

* chore: add build and docker badges to readme

* chore: add .dockerignore

* ci: add docker hub image publish workflow

Author: bchew

.dockerignore

@@ -0,0 +1,11 @@
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+env
+pip-log.txt
+.git
+.DS_Store
+README.md
+Dockerfile

.github/workflows/docker.yml

@@ -0,0 +1,38 @@
+name: Publish Docker image
+
+on:
+  push:
+    branches:
+      - 'master'
+    tags:
+      - 'v*'
+  pull_request:
+    branches: [master]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+      
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: bchew/dynamodump
+      
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -1,6 +1,8 @@
 # dynamodump
 
 [![PyPI version](https://badge.fury.io/py/dynamodump.svg)](https://badge.fury.io/py/dynamodump)
+[![Docker](https://img.shields.io/docker/cloud/build/bchew/dynamodump?label=Docker&style=flat)](https://hub.docker.com/r/bchew/dynamodump/builds)
+![Build Status](https://github.com/bchew/dynamodump/workflows/build/badge.svg)
 ![Linting Status](https://github.com/bchew/dynamodump/workflows/Linting/badge.svg)
 ![Test Status](https://github.com/bchew/dynamodump/workflows/Test/badge.svg)