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

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

@@ -0,0 +1,28 @@
+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