feat: Add Dockerfile and Github Action.

This will allow CI for creating Docker images on push.
Should be changed from push to pull_request once we feel more
comfortable with the solution.

Author: Eran Davidovich

.github/workflows/docker-image.yml

@@ -0,0 +1,30 @@
+name: Build Docker image
+
+on: [push]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - 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
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          platforms: linux/amd64
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/pyth-client-py:{{ git_sha }} # should be tagged latest later on
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

Dockerfile

@@ -0,0 +1,10 @@
+# syntax=docker/dockerfile:1.2
+
+FROM python:3.8-alpine
+
+WORKDIR /app
+
+COPY . .
+
+RUN pip3 install --no-cache-dir -r requirements.txt && \
+python setup.py install