Initialize Dockerfile and app.py for Lambda function setup

Dockerfile

@@ -0,0 +1,14 @@
+FROM public.ecr.aws/lambda/python:3.11
+
+# Copy requirements first to leverage Docker cache
+COPY requirements.txt /tmp/
+RUN pip install --no-cache-dir -r /tmp/requirements.txt -t ${LAMBDA_TASK_ROOT}
+
+# Copy the template_automation package
+COPY template_automation/ ${LAMBDA_TASK_ROOT}/template_automation/
+
+# Copy the root app.py file (this is essential for AWS Lambda to find the handler)
+COPY app.py ${LAMBDA_TASK_ROOT}/
+
+# Ensure the Lambda handler is correctly set
+CMD [ "app.lambda_handler" ]

app.py

@@ -0,0 +1,11 @@
+"""
+Lambda function entrypoint that imports the handler from the template_automation package.
+
+This file resolves the 'attempted relative import with no known parent package'
+error by placing an entrypoint at the root level of the Lambda package.
+"""
+
+from template_automation.app import lambda_handler
+
+# Re-export the lambda_handler function for Lambda runtime to find it
+__all__ = ['lambda_handler']

packer.pkr.hcl

@@ -34,7 +34,12 @@ build {
 
   provisioner "file" {
     source      = "./template_automation/"
-    destination = "/var/task"
+    destination = "/var/task/template_automation/"
+  }
+
+  provisioner "file" {
+    source      = "./app.py"
+    destination = "/var/task/app.py"
   }
 
   provisioner "shell" {