Fix empty inputs issue + validation check (#3)

* Fix entrypoint.sh by adding missing "INPUT_" in front of each arg

* Move validate_inputs() prior any run of other functions

action/check_alembic_migration.py

@@ -55,16 +55,16 @@ def __init__(
         self.db_name = db_name
         self.migrations_path = migrations_path
 
+        validation_error = self._validate_inputs()
+        if validation_error:
+            raise ValueError(validation_error)
+
         self.db_url = self._get_database_url()
         self.engine = create_engine(self.db_url)
 
         self._alembic_cfg = None
         self._script_directory = None
 
-        validation_error = self._validate_inputs()
-        if validation_error:
-            raise ValueError(validation_error)
-
     def _validate_inputs(self):
         """
         Validates the necessary inputs for connecting to a database and accessing the migrations folder path.

action/entrypoint.sh

@@ -1,3 +1,3 @@
 #!/bin/sh -l
 
-python /check_alembic_migration.py "${DB_TYPE}" "${DB_HOST}" "${DB_PORT}" "${DB_USER}" "${DB_PASSWORD}" "${DB_NAME}" "${MIGRATIONS_PATH}"
+python /check_alembic_migration.py "${INPUT_DB_TYPE}" "${INPUT_DB_HOST}" "${INPUT_DB_PORT}" "${INPUT_DB_USER}" "${INPUT_DB_PASSWORD}" "${INPUT_DB_NAME}" "${INPUT_MIGRATIONS_PATH}"