feat(#85): support SLL_CERT_FILE env property

[codecov[bot]]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (0ea0284) 79.60% compared to head (c6af2d0) 79.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #87 +/- ## ========================================== - Coverage 79.60% 79.22% -0.39% ========================================== Files 64 65 +1 Lines 3148 3181 +33 ========================================== + Hits 2506 2520 +14 - Misses 496 514 +18 - Partials 146 147 +1 ``` | [Files](https://app.codecov.io/gh/mk-5/fjira/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mk5) | Coverage Δ | | |---|---|---| | [internal/jira/jira.go](https://app.codecov.io/gh/mk-5/fjira/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mk5#diff-aW50ZXJuYWwvamlyYS9qaXJhLmdv) | `76.00% <100.00%> (ø)` | | | [internal/jira/transport.go](https://app.codecov.io/gh/mk-5/fjira/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mk5#diff-aW50ZXJuYWwvamlyYS90cmFuc3BvcnQuZ28=) | `42.42% <42.42%> (ø)` | |

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