Add workflow to push to Docker Hub

Author: catarak

.github/workflows/deploy-staging.yml

@@ -0,0 +1,21 @@
+name: Deploy to staging
+on:
+  push:
+    branches:
+      - chore/github-actions
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: ${{ secrets.DOCKER_USERNAME }}/p5.js-web-editor-staging
+          tag_with_ref: true
+          target: production
+

docker-compose.yml

@@ -41,6 +41,9 @@ services:
       - ML5_EXAMPLES_USERNAME
       - ML5_EXAMPLES_PASS
       - ML5_EXAMPLES_EMAIL
+      - UI_ACCESS_TOKEN_ENABLED
+      - UPLOAD_LIMIT
+      - TRANSLATIONS_ENABLED
       # you can either set this in your .env or as an environment variables
       # or here YOU CHOOSE
       # - MONGO_URL=mongodb://mongo:27017/p5js-web-editor