Add initial project setup with Docker, GitHub Actions, and meal timetable functionality

- Create Dockerfile for multi-stage build
- Set up GitHub Actions workflow for CI/CD
- Implement meal and timetable fetching logic
- Add README and configuration files
- Include cron job for scheduled execution
- Establish .gitignore for build artifacts and environment files

.github/workflows/main.yml

@@ -0,0 +1,35 @@
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+name: Web Build
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          tags: |
+            ghcr.io/imnyang/today.sunrin:latest
+            ghcr.io/imnyang/today.sunrin:${{ github.run_id }}