Predefined service: FastAPI (#314)

* Add predefined service template for FastAPI

* Add README

* Add to supported services

predefined-services/backend/fastapi/README.md

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+## FastAPI
+FastAPI is a high-performance, easy to learn, fast to code and ready for production framework for building APIs. It is based on Python 3.6+ and can handle massive amounts of requests in parallel due to its asynchronous programming style.
+
+### Setup
+FastAPI is considered as backend service and can therefore be found in backends collection, when generating the compose configuration with Compose Generator.
+
+### Usage
+Compose Generator provides a basic Hello World API out of the box which can be found at the url root.

predefined-services/backend/fastapi/backend-fastapi/Dockerfile

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+FROM python:${{FASTAPI_PYTHON_VERSION}}-alpine
+WORKDIR /app
+
+COPY ./requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir --upgrade -r ./requirements.txt
+
+COPY ./app ./app
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"]

predefined-services/backend/fastapi/backend-fastapi/app/main.py

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+from typing import Optional
+
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+def read_root():
+    return {"Hello": "World"}
+
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: Optional[str] = None):
+    return {"item_id": item_id, "q": q}

predefined-services/backend/fastapi/backend-fastapi/requirements.txt

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+fastapi==${{FASTAPI_VERSION}}
+pydantic==1.9.0
+uvicorn==0.17.6

predefined-services/backend/fastapi/config.json

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+{
+    "label": "FastAPI",
+    "preselected": "false",
+    "proxied": true,
+    "files": [
+        {
+            "path": "service.yml",
+            "type": "service"
+        },
+        {
+            "path": "README.md",
+            "type": "docs"
+        },
+        {
+            "path": "${{FASTAPI_SOURCE_DIRECTORY}}/Dockerfile",
+            "type": "config"
+        },
+        {
+            "path": "${{FASTAPI_SOURCE_DIRECTORY}}/requirements.txt",
+            "type": "config"
+        }
+    ],
+    "questions": [
+        {
+            "text": "On which port you want to expose your FastAPI?",
+            "type": 2,
+            "defaultValue": "80",
+            "validator": "port",
+            "variable": "FASTAPI_PORT"
+        },
+        {
+            "text": "Which Python version do you want to use?",
+            "type": 2,
+            "defaultValue": "3.10",
+            "variable": "FASTAPI_PYTHON_VERSION"
+        },
+        {
+            "text": "Which FastAPI version do you want to use?",
+            "type": 2,
+            "defaultValue": "0.75.2",
+            "variable": "FASTAPI_VERSION"
+        }
+    ],
+    "volumes": [
+        {
+            "text": "Custom path for backend source directory?",
+            "defaultValue": "./backend-fastapi",
+            "variable": "FASTAPI_SOURCE_DIRECTORY"
+        }
+    ]
+}

predefined-services/backend/fastapi/service.yml

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+build: ${{FASTAPI_SOURCE_DIRECTORY}}
+container_name: ${{PROJECT_NAME_CONTAINER}}-backend-fastapi
+restart: always
+networks:
+#? if has services.frontend {
+#  - frontend-backend
+#? }
+#? if has services.database {
+#  - backend-database
+#? }
+ports:
+  - ${{FASTAPI_PORT}}:80