ci: set up nextest profile and dev-ci Cargo profile

- Added a "dev-ci" profile in `Cargo.toml` file,
- Introduced a new `nextest.toml` configuration file to manage test behaviors in the CI environment.

.config/nextest.toml

@@ -0,0 +1,12 @@
+[profile.ci]
+# Print out output for failing tests as soon as they fail, and also at the end
+# of the run (for easy scrollability).
+failure-output = "immediate-final"
+# Show skipped tests in the CI output.
+status-level = "skip"
+# Do not cancel the test run on the first failure.
+fail-fast = false
+# Mark tests as slow after 5mins, kill them after 20mins
+slow-timeout = { period = "300s", terminate-after = 4 }
+# Retry failed tests once, marked flaky if test then passes
+retries = 1

Cargo.toml

@@ -92,3 +92,11 @@ ec-gpu = { version = "0.2.0" }
 ec-gpu-gen = { version = "0.7.0" }
 log = "0.4.19"
 byteorder = "1"
+
+[profile.dev-ci]
+inherits = "dev"
+# By compiling dependencies with optimizations, performing tests gets much faster.
+opt-level = 3
+lto = "thin"
+incremental = false
+codegen-units = 16