Issue/2 hour backfill (#84)

* use docker compose

* 2 hours of backfill

* add to readme

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

README.md

@@ -18,6 +18,7 @@ N_GSPS: The number of gsps you want to pull
 INCLUDE_NATIONAL: Option to load national data, or not
 UK_LONDON_HOUR: Optional to check UK London hour. This means can run this service at the same
    UTC times, independently of the clock change.
+BACKFILL_HOURS: Optional, defaults to 2. The amount of hours of data that is backfilled.
 
 These options can also be enter like this:
 ```

gspconsumer/app.py

@@ -145,7 +145,8 @@ def pull_data_and_save(
         datetime_utc = datetime.utcnow().replace(tzinfo=timezone.utc)  # add timezone
 
     if regime == "in-day":
-        start = datetime_utc - timedelta(hours=1)
+        backfill_hours = os.getenv("BACKFILL_HOURS", 2)
+        start = datetime_utc - timedelta(hours=backfill_hours)
         end = datetime_utc + timedelta(minutes=30)
     else:
         start = datetime_utc.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(