ci: add docker image build and push on develop

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: Overseerr CI
 on:
   pull_request:
     branches:
-      - "*"
+      - '*'
   push:
     branches:
       - develop
@@ -23,3 +23,16 @@ jobs:
         run: yarn lint
       - name: build
         run: yarn build
+  build_and_push:
+    name: Build and push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Build and push to Docker Hub
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: sctx/overseerr
+          tags: latest