Add support for CORS allowCredentials

[codecov-commenter]

Codecov Report

Patch coverage: 55.00% and project coverage change: -0.12% :warning:

Comparison is base (cccd396) 73.77% compared to head (0d299b0) 73.66%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #385 +/- ## ========================================== - Coverage 73.77% 73.66% -0.12% ========================================== Files 48 48 Lines 5651 5669 +18 ========================================== + Hits 4169 4176 +7 - Misses 1194 1201 +7 - Partials 288 292 +4 ``` | [Files Changed](https://app.codecov.io/gh/komuw/ong/pull/385?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu) | Coverage Δ | | |---|---|---| | [middleware/cors.go](https://app.codecov.io/gh/komuw/ong/pull/385?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bWlkZGxld2FyZS9jb3JzLmdv) | `92.30% <40.00%> (-2.70%)` | :arrow_down: | | [config/config.go](https://app.codecov.io/gh/komuw/ong/pull/385?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-Y29uZmlnL2NvbmZpZy5nbw==) | `64.54% <62.50%> (-0.04%)` | :arrow_down: | | [middleware/middleware.go](https://app.codecov.io/gh/komuw/ong/pull/385?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bWlkZGxld2FyZS9taWRkbGV3YXJlLmdv) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/komuw/ong/pull/385/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu)

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