feat: do not spam comments

[yknx4]

Do not create multiple comments, instead update the latest one
closes #142

[librecov]

Librecov Report

Hey @yknx4

Merging features/single-comment (d426cb3) will decrease coverage by -0.01%.
The diff coverage is 58.26%.

Impacted Files	Coverage Δ
lib/opencov/services/github/auth.ex	69.57% <-4.51%> (Δ)	⬇️
lib/opencov/services/github/comments.ex	45.83% <6.94%> (Δ)	⬆️
lib/opencov/services/github/config.ex	80.0% <-20.0%> (Δ)	⬇️

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[yknxopencov]

Librecov Report

Hey @yknx4

Merging features/single-comment (5a1bf0f) will decrease coverage by -0.08%.
The diff coverage is 58.44%.

Impacted Files	Coverage Δ
lib/librecov_web/live/repository_live/repository_card.ex	93.33% <-3.1%> (Δ)	⬇️
lib/opencov/services/github/auth.ex	69.57% <-4.51%> (Δ)	⬇️
lib/opencov/services/github/checks.ex	71.43% <3.43%> (Δ)	⬆️
lib/opencov/services/github/comments.ex	45.83% <6.94%> (Δ)	⬆️
lib/opencov/services/github/config.ex	100.0% <0.0%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[librecov]

Librecov Report

Hey @yknx4

Merging features/single-comment (5a1bf0f) will increase coverage by 0.18%.
The diff coverage is 58.44%.

Impacted Files	Coverage Δ
lib/opencov/services/github/auth.ex	69.57% <-4.51%> (Δ)	⬇️
lib/opencov/services/github/comments.ex	45.83% <6.94%> (Δ)	⬆️
lib/opencov/services/github/config.ex	100.0% <0.0%> (ø)
lib/opencov/services/github/checks.ex	71.43% <3.43%> (Δ)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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