[GH/WORKFLOW] Added docker workflow

.github/workflows/buildDockerImage.yml

@@ -0,0 +1,21 @@
+# Building Docker image and pushing it to Docker Hub
+
+name: Build Docker Image
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build Docker image
+        run: |
+          docker build -t ${{ secrets.DOCKER_USERNAME }}/botator:${{ github.sha }} .
+      - name: Push Docker image to Docker Hub
+        run: |
+          echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin
+          docker push ${{ secrets.DOCKER_USERNAME }}/botator:${{ github.sha }}