Add GitHub Actions workflow for deployment

Author: AlexBa16

.github/workflows/US1.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: US1
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build-and-deploy:"
+  build-and-deploy:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v4
+
+      - name: Build Docker image and save to tar
+        run: |
+          docker build -t mealplan:staging .
+          docker save mealplan:staging -o mealplan.tar
+
+      - name: Copy image + compose file to server
+        uses: appleboy/scp-action@v0.1.7
+        with:
+          host: ${{ secrets.STAGING_HOST }}
+          username: ${{ secrets.STAGING_USER }}
+          key: ${{ secrets.STAGING_SSH_KEY }}
+          source: |
+            mealplan.tar
+            docker-compose.yaml
+          target: "~/deploy"
+
+      - name: Deploy with docker compose
+        uses: appleboy/ssh-action@v0.1.10
+        with:
+          host: ${{ secrets.STAGING_HOST }}
+          username: ${{ secrets.STAGING_USER }}
+          key: ${{ secrets.STAGING_SSH_KEY }}
+          script: |
+            set -e
+            cd ~/deploy
+            echo "Lade Image ins lokale Docker-Registry..."
+            docker load -i mealplan.tar
+            echo "Stoppe alte Container falls vorhanden..."
+            docker compose down || true
+            echo "Starte neue Container..."
+            docker compose up -d --force-recreate
+            echo "Deployment abgeschlossen"
+            rm mealplan.tar
+
+      - name: Fetch container logs for review
+        uses: appleboy/ssh-action@v0.1.10
+        with:
+          host: ${{ secrets.STAGING_HOST }}
+          username: ${{ secrets.STAGING_USER }}
+          key: ${{ secrets.STAGING_SSH_KEY }}
+          script: |
+            cd ~/deploy
+            echo "Container-Logs der letzten 50 Zeilen:"
+            docker compose logs --tail=50