Different values for `git config --get-all`

I'm attempt to use `git secrets --scan-history` in CI, but I'm currently get false-positives because `git config --get-all secrets.patterns` is empty on my CI server but populated on my development machine.

# CI

```shell
$ git config --get-all secrets.patterns
(sk|pk)_(test|live)_[0-9a-zA-Z]{99}
$ cat .git/config
[secrets]
patterns = (sk|pk)_(test|live)_[0-9a-zA-Z]{99}
```

# Dev

```shell
$ git config --get-all secrets.patterns
(A3T[A-Z0-9]|AKIA|AGPA|AIDA|AROA|AIPA|ANPA|ANVA|ASIA)[A-Z0-9]{16}
("|')?(AWS|aws|Aws)?_?(SECRET|secret|Secret)?_?(ACCESS|access|Access)?_?(KEY|key|Key)("|')?\s*(:|=>|=)\s*("|')?[A-Za-z0-9/\+=]{40}("|')?
("|')?(AWS|aws|Aws)?_?(ACCOUNT|account|Account)_?(ID|id|Id)?("|')?\s*(:|=>|=)\s*("|')?[0-9]{4}\-?[0-9]{4}\-?[0-9]{4}("|')?
AIza[0-9A-Za-z_-]{35}
[0-9]+-[0-9A-Za-z_]{32}\.apps\.googleusercontent\.com
(^|[^0-9A-Za-z/+])1/[0-9A-Za-z_-]{43}
(^|[^0-9A-Za-z/+])1/[0-9A-Za-z_-]{64}
ya29\.[0-9A-Za-z_-]+
(sk|pk)_(test|live)_[a-zA-Z0-9]{99}
$ command cat .git/config
[secrets]
patterns = (sk|pk)_(test|live)_[a-zA-Z0-9]{99}
```

# Investigation

Where else can these `secrets.patterns` be defined? On my dev machine, I searched through my `history` for any calls `--add-provider` or `--add` for patterns, but I cannot find anything that would've added all of these patterns:

```shell
$ history | egrep '^git(-| )secrets' | sort | uniq
git secrets
git secrets --add-provider -- git secrets
git secrets --add-provider -h
git secrets --commit_msg_hook
git secrets --help
git secrets --install
git-secrets --list
git-secrets --list --help
git secrets --register-gcp
git secrets --scan
git secrets scan
git-secrets --scan
git secrets --scan | grep Stripe
git secrets --scan-history
```

I also tried to find any `gitconfig` file that might have a `[secrets]` header... I haven't found anything yet:

```shell
$ sudo updatedb
$ locate gitconfig | xargs rg '\[secrets\]'
# empty
```

To be clear, I'd like my CI machine to have the same patterns as my dev machine. Can someone help me troubleshoot this? Both machines are using `git-secrets-1.3.0`.

Start by comparing `git config --get-all secrets.patterns` and the repository `.git/config` on both machines, then inspect the configuration sources used by `git-secrets --scan-history`. Trace why the development machine has additional patterns despite the shown repository config; done means the cause is identified and the CI machine can load the same patterns reliably.

Written by the indexing model from the issue text.