[Deployment] Setup fly.io deployment method and update docs (#1028)

Co-authored-by: sidmohanty11 <sidmohanty11@gmail.com>

embedchain/deployment/modal.com/.env.example

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+OPENAI_API_KEY=

embedchain/deployment/modal.com/.gitignore

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+.env

embedchain/deployment/modal.com/app.py

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+from dotenv import load_dotenv
+from fastapi import Body, FastAPI, responses
+from modal import Image, Secret, Stub, asgi_app
+
+from embedchain import Pipeline
+
+load_dotenv(".env")
+
+image = Image.debian_slim().pip_install(
+    "embedchain",
+    "embedchain[dataloaders]",
+)
+
+stub = Stub(
+    name="embedchain-app",
+    image=image,
+    secrets=[Secret.from_dotenv(".env")],
+)
+
+web_app = FastAPI()
+embedchain_app = Pipeline(name="embedchain-modal-app")
+
+
+@web_app.post("/add")
+async def add(
+    source: str = Body(..., description="Source to be added"),
+    data_type: str | None = Body(None, description="Type of the data source"),
+):
+    """
+    Adds a new source to the EmbedChain app.
+    Expects a JSON with a "source" and "data_type" key.
+    "data_type" is optional.
+    """
+    if source and data_type:
+        embedchain_app.add(source, data_type)
+    elif source:
+        embedchain_app.add(source)
+    else:
+        return {"message": "No source provided."}
+    return {"message": f"Source '{source}' added successfully."}
+
+
+@web_app.post("/query")
+async def query(question: str = Body(..., description="Question to be answered")):
+    """
+    Handles a query to the EmbedChain app.
+    Expects a JSON with a "question" key.
+    """
+    if not question:
+        return {"message": "No question provided."}
+    answer = embedchain_app.query(question)
+    return {"answer": answer}
+
+
+@web_app.get("/chat")
+async def chat(question: str = Body(..., description="Question to be answered")):
+    """
+    Handles a chat request to the EmbedChain app.
+    Expects a JSON with a "question" key.
+    """
+    if not question:
+        return {"message": "No question provided."}
+    response = embedchain_app.chat(question)
+    return {"response": response}
+
+
+@web_app.get("/")
+async def root():
+    return responses.RedirectResponse(url="/docs")
+
+
+@stub.function(image=image)
+@asgi_app()
+def fastapi_app():
+    return web_app

embedchain/deployment/modal.com/requirements.txt

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+modal==0.56.4329
+fastapi==0.104.0
+uvicorn==0.23.2
+embedchain==0.1.34