feat: Add Docker workflows for building, testing, and deploying the application; include Dockerfile for image creation

.gitea/workflows/build-and-push.yml

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+name: Build and Push Docker Image
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Login to Gitea Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ secrets.GITEA_REGISTRY }}
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ secrets.GITEA_REGISTRY }}/${{ secrets.GITEA_USERNAME }}/calminer:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.gitea/workflows/deploy.yml

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+name: Deploy to Server
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: SSH and deploy
+        uses: appleboy/ssh-action@master
+        with:
+          host: ${{ secrets.SSH_HOST }}
+          username: ${{ secrets.SSH_USERNAME }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          script: |
+            docker pull ${{ secrets.GITEA_REGISTRY }}/${{ secrets.GITEA_USERNAME }}/calminer:latest
+            docker stop calminer || true
+            docker rm calminer || true
+            docker run -d --name calminer -p 8000:8000 ${{ secrets.GITEA_REGISTRY }}/${{ secrets.GITEA_USERNAME }}/calminer:latest

.gitea/workflows/test.yml

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+name: Run Tests
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.10"
+      - name: Cache pip
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - name: Install dependencies
+        run: pip install -r requirements.txt
+      - name: Run tests
+        run: pytest