chore: Add github workflow for Docker builds

Author: orhun

.github/workflows/docker.yml

@@ -0,0 +1,38 @@
+name: Docker Automated Builds
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  docker:
+    name: Docker
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Build
+        run: |
+          docker build -f docker/cli/Dockerfile -t godsays .
+          docker build -f docker/server/Dockerfile -t godsays-server .
+      - name: Tag
+        run: |
+          docker tag godsays orhunp/godsays:latest
+          docker tag godsays docker.pkg.github.com/orhun/godsays/godsays:latest
+          docker tag godsays-server orhunp/godsays-server:latest
+          docker tag godsays-server docker.pkg.github.com/orhun/godsays/godsays-server:latest
+      - name: Login (Docker Hub)
+        run: echo ${{ secrets.DOCKERHUB_PASS }} |
+          docker login -u orhunp --password-stdin
+      - name: Push (Docker Hub)
+        run: |
+          docker push orhunp/godsays:latest
+          docker push orhunp/godsays-server:latest
+      - name: Login (Package Registry)
+        run: echo ${{ secrets.GITHUB_TOKEN }} |
+          docker login -u orhun docker.pkg.github.com --password-stdin
+      - name: Push (Package Registry)
+        run: |
+          docker push docker.pkg.github.com/orhun/godsays/godsays:latest
+          docker push docker.pkg.github.com/orhun/godsays/godsays-server:latest