create workflow

.github/workflows/publish-docker-image.yml

@@ -0,0 +1,21 @@
+name: Publish Docker image
+on:
+  push:
+    branches: [ main ]
+jobs:
+  push_to_docker_hub:
+    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_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: rongronggg9/slashbot:latest