Add lambda dockerfile and deployment workflow

.github/workflows/deploy-lambda.yml

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+name: Deploy Python Lambda
+
+on:
+  push:
+    branches: ['main']
+    paths: ['src/backend/**']
+  workflow_dispatch:
+
+env:
+  AWS_REGION: us-east-2
+  ECR_REPOSITORY: mdst/mini-copilot
+  CONTAINER_NAME: mini-copilot
+  LAMBDA_FUNCTION_NAME: mini-copilot-lambda
+
+jobs:
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    environment: production
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@0e613a0980cbf65ed5b322eb7a1e075d28913a83
+        with:
+          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          aws-region: ${{ env.AWS_REGION }}
+
+      - name: Login to Amazon ECR
+        id: login-ecr
+        uses: aws-actions/amazon-ecr-login@62f4f872db3836360b72999f4b87f1ff13310f3a
+
+      - name: Build, tag, and push image to Amazon ECR
+        id: build-image
+        working-directory: ./src/backend
+        env:
+          ECR_REGISTRY: ${{ steps.login-ecr.outputs.registry }}
+          IMAGE_TAG: ${{ github.sha }}
+        run: |
+          # Build a docker container and push it to ECR
+          aws s3 cp s3://mini-copilot/trained/ ./trained --recursive
+          docker build -t $ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG .
+          docker push $ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG
+          echo "image=$ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG" >> $GITHUB_OUTPUT
+
+      - name: Update Lambda Function
+        run: |
+          aws lambda update-function-code --function-name ${{ env.LAMBDA_FUNCTION_NAME }} \
+            --region ${{ env.AWS_REGION }} \
+            --image-uri ${{ steps.build-image.outputs.image }}

src/backend/Dockerfile

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+FROM public.ecr.aws/lambda/python:3.12
+
+# Copy requirements.txt
+COPY lambda_requirements.txt ${LAMBDA_TASK_ROOT}
+
+# Install the specified packages
+RUN pip install --compile --no-cache-dir -r lambda_requirements.txt
+
+# Copy model
+COPY trained/gpt2-728 ${LAMBDA_TASK_ROOT}/trained/gpt2-728
+
+# Copy function code
+COPY lambda_function.py ${LAMBDA_TASK_ROOT}
+
+# Set the CMD to your handler
+CMD [ "lambda_function.handler" ]

src/backend/lambda_requirements.txt

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+boto3
+transformers
+pytorch