docs(contributing): add note that postgres tests require UTC

[kenstir]

The tests fail if the host is not configured for UTC. A note in the CONTRIBUTING doc would have saved me hours debugging the failed test.

$ sudo timedatectl set-timezone America/New_York
$ go clean -testcache
$ go test ./internal/database -tags=integration
...
--- FAIL: TestFilterRepo_GetDownloadsByFilterId (0.03s)
    --- FAIL: TestFilterRepo_GetDownloadsByFilterId/GetDownloadsByFilterId_Succeeds_[postgres] (0.02s)
        filter_test.go:817:
                Error Trace:    /home/kenstir/opensource/autobrr/internal/database/filter_test.go:817
                Error:          Not equal:
                                expected: &domain.FilterDownloads{HourCount:0, DayCount:0, WeekCount:1, MonthCount:1, TotalCount:1}
                                actual  : &domain.FilterDownloads{HourCount:1, DayCount:1, WeekCount:1, MonthCount:1, TotalCount:1}

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1,4 +1,4 @@
                                 (*domain.FilterDownloads)({
                                - HourCount: (int) 0,
                                - DayCount: (int) 0,
                                + HourCount: (int) 1,
                                + DayCount: (int) 1,
                                  WeekCount: (int) 1,
                Test:           TestFilterRepo_GetDownloadsByFilterId/GetDownloadsByFilterId_Succeeds_[postgres]
FAIL
FAIL    github.com/autobrr/autobrr/internal/database    1.513s

If you change to UTC, they pass:

$ sudo timedatectl set-timezone Etc/UTC
$ go clean -testcache
$ go test ./internal/database -tags=integration
ok      github.com/autobrr/autobrr/internal/database    1.505s

[s0up4200]

Hm, weird. Works in macOS using CEST.

[kenstir]

Well now that is weird that it works for you in CEST. I tracked it down to this INSERT, and just presumed that the caller was using local time. The postgres container logged an insert at 2024-05-11T00:16:28 but param $9 to the insert was 2024-05-10 20:16:28 (local time):

autobrr_postgres_test  | 2024-05-11T00:16:28.517315851Z 2024-05-11 00:16:28.517 UTC [34] LOG:  execute <unnamed>: INSERT INTO release_action_status (status,action,action_id,type,client,filter,filter_id,rejections,timestamp,release_id) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10) RETURNING id
autobrr_postgres_test  | 2024-05-11T00:16:28.517332177Z 2024-05-11 00:16:28.517 UTC [34] DETAIL:  parameters: $1 = 'PUSH_APPROVED', $2 = 'okay', $3 = '11', $4 = 'TEST', $5 = 'qbitorrent', $6 = 'Test filter', $7 = '50', $8 = '{"one rejection","two rejections"}', $9 = '2024-05-10 20:16:28', $10 = '1'