Added app_start function to call alembic scripts (#37)

Closes #36

src/main.py

@@ -1,8 +1,22 @@
+import os
+
 from fastapi import FastAPI
 
 from routers import filing_router
 
+from alembic.config import Config
+from alembic import command
+
 app = FastAPI()
 
 
+@app.on_event("startup")
+async def app_start():
+    file_dir = os.path.dirname(os.path.realpath(__file__))
+    alembic_cfg = Config(f"{file_dir}/../alembic.ini")
+    alembic_cfg.set_main_option("script_location", f"{file_dir}/../db_revisions")
+    alembic_cfg.set_main_option("prepend_sys_path", f"{file_dir}/../")
+    command.upgrade(alembic_cfg, "head")
+
+
 app.include_router(filing_router, prefix="/v1/filing")