Certificate transparency

[maraino]

Description

This PR adds alpha support for certificate transparency support in step certificates.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@963fe0f). Click here to learn what that means.
The diff coverage is 82.32%.

@@            Coverage Diff            @@
##             master     #127   +/-   ##
=========================================
  Coverage          ?   78.29%           
=========================================
  Files             ?       56           
  Lines             ?     6109           
  Branches          ?        0           
=========================================
  Hits              ?     4783           
  Misses            ?     1075           
  Partials          ?      251

Impacted Files	Coverage Δ
authority/provisioners.go	71.42% <ø> (ø)
authority/provisioner/gcp.go	95.34% <ø> (ø)
authority/tls.go	60.66% <ø> (ø)
authority/provisioner/noop.go	88.88% <ø> (ø)
authority/provisioner/provisioner.go	39.16% <ø> (ø)
ca/ca.go	54.85% <ø> (ø)
ca/acmeClient.go	82.58% <ø> (ø)
ca/client.go	67.25% <ø> (ø)
authority/provisioner/aws.go	86.53% <ø> (ø)
authority/provisioner/jwk.go	89.36% <ø> (ø)
... and 42 more

---

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

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ dopey
✅ maraino
❌ josephvoss
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[codecov-commenter]

Codecov Report

Merging #127 into master will increase coverage by 1.03%.
The diff coverage is 82.11%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   77.25%   78.29%   +1.03%     
==========================================
  Files          21       56      +35     
  Lines        1750     6109    +4359     
==========================================
+ Hits         1352     4783    +3431     
- Misses        282     1075     +793     
- Partials      116      251     +135     

Impacted Files	Coverage Δ
authority/error.go	16.66% <0.00%> (-16.67%)	⬇️
authority/provisioner/aws.go	86.53% <ø> (ø)
authority/provisioner/azure.go	94.02% <ø> (ø)
authority/provisioner/claims.go	69.04% <ø> (ø)
authority/provisioner/collection.go	82.90% <ø> (ø)
authority/provisioner/duration.go	100.00% <ø> (ø)
authority/provisioner/gcp.go	95.34% <ø> (ø)
authority/provisioner/jwk.go	89.36% <ø> (ø)
authority/provisioner/keystore.go	94.80% <ø> (ø)
authority/provisioner/method.go	100.00% <ø> (ø)
... and 88 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 37d7231...abd0cf2. Read the comment docs.