Merge torrust#1255: Overhaul core Tracker: add tests for databases mod

2cd1c65 test: [torrust#1251] add tests for database driver error converters (Jose Celano)
adb9614 tests: [torrust#1251] add test for loading keys in DB drivers (Jose Celano)
700482d test: [torrust#1251] reset database before running db driver tests (Jose Celano)
b9188c7 test: [torrust#1251] add tests for whitelist is DB drivers (Jose Celano)
613efb2 fix: [torrust#1257] bug 3. Expiring auth keys ignore fractions of seconds (Jose Celano)
b94179d fix: [torrust#1257] bug 2. Auth keys can't be removed in MySQL (Jose Celano)
595397b fix: [torrust#1257] bug 1. permanent keys can't be created in MySQL (Jose Celano)
7ddacdc test: [torrust#1251] unify test runner for sqlite and mysql drivers (Jose Celano)
46949a6 test: [torrust#1251] add tests for core database driver mysql (Jose Celano)
568d6d3 test: [torrust#1251] add tests for core database driver sqlite (Jose Celano)

Pull request description:

  Overhaul core Tracker: add tests for `databases` mod.

  Regarding the database drivers these are the methods in the Database trait grouped by context:

  Schema:

  - create_database_tables
  - drop_database_tables (this is only used for testing)

  Persistent torrents (stats):

  - [x] load_persistent_torrents
  - [x] save_persistent_torrent

  Authentication keys (for private trackers):

  - [x] load_keys
  - [x] get_key_from_keys
  - [x] add_key_to_keys
  - [x] remove_key_from_keys

  Whitelist (for listed trackers):

  - [x] load_whitelist
  - [x] get_info_hash_from_whitelist
  - [x] add_info_hash_to_whitelist
  - [x] remove_info_hash_from_whitelist

  ### Sub-tasks

  - [x] `driver`
    - [x] `mod.rs` (no direct tests added)
    - [x] `mysql.rs`
    - [x] `sqlite.rs`
  - [x] `error.rs`
  - [x] `mod.rs` (no direct tests added)
  - [x] `setup.rs` (no direct tests added)

ACKs for top commit:
  josecelano:
    ACK 2cd1c65

Tree-SHA512: 07e92b5458053ae27b424bbd0d9bd35cf44b0a8a1ac2c16eb4c64016295b6770a5b426a132002d091c0fab7e754d198f2906498f733119f386831bdcac50aa1e

Author: josecelano

.github/workflows/testing.yaml

@@ -146,6 +146,10 @@ jobs:
         name: Run Unit Tests
         run: cargo test --tests --benches --examples --workspace --all-targets --all-features
 
+      - id: database
+        name: Run MySQL Database Tests
+        run: TORRUST_TRACKER_CORE_RUN_MYSQL_DRIVER_TEST=true cargo test --package bittorrent-tracker-core
+
   e2e:
     name: E2E
     runs-on: ubuntu-latest