Add post letters endpoint (#231) #1535

Job	Run time
Set CI/CD metadata	8s
Commit stage / Check English usage	9s
Commit stage / Check file format	6s
Commit stage / Check TODO usage	4s
Commit stage / Scan secrets	8s
Commit stage / Check Markdown format	6s
Commit stage / Scan dependencies	31s
Commit stage / Count lines of code	10s
Commit stage / Check for changes to event schema package compared to main branch	6s
Commit stage / Detect Terraform Changes	6s
Commit stage / Check event schema version has been updated	0s
Commit stage / Lint Terraform	0s
Commit stage / Run terraform-docs	0s
Commit stage / Trivy Scan	-1s
Test stage / Check generated dependencies	1m 13s
Test stage / Typecheck	1m 9s
Test stage / Unit tests	3m 3s
Test stage / Linting	1m 3s
Test stage / Perform static analysis	1m 1s
Test stage / Test coverage	5s
Build stage / Build SDKs	1m 39s
Build stage / Build proxies	3m 25s
Build stage / Build Docs	2m 7s
Acceptance stage / Contract test	22s
Publish stage / Publish packages	24s
Publish stage / Publish npm packages to npm.pkg.github.com	17s
Publish stage / Publish nuget packages to nuget.pkg.github.com	11s
Publish stage / Success notification	3s
	17m 35s

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