fix: resolve CI failures in cargo-nextest migration

- Serialize `dashd_sync` integration tests via nextest test-groups
  (nextest runs each test as a separate process concurrently, causing
  dashd resource contention and crashes)
- Add `--no-tests=pass` to nextest commands so crates with zero tests
  (like `dash-fuzz`) don't fail
- Output explicit JUnit file list instead of glob pattern to avoid
  Windows path expansion issues with codecov CLI

Author: xdustinface

.config/nextest.toml

@@ -1,5 +1,14 @@
+[test-groups]
+dashd-integration = { max-threads = 1 }
+
 [profile.ci]
 fail-fast = false
 
 [profile.ci.junit]
 path = "junit.xml"
+
+# dashd integration tests each start their own dashd process;
+# running them concurrently causes resource contention and crashes.
+[[profile.ci.overrides]]
+filter = 'binary(dashd_sync)'
+test-group = 'dashd-integration'

.github/scripts/ci_config.py

@@ -135,12 +135,14 @@ def run_group_tests(args):
                 "cargo", "llvm-cov", "nextest",
                 "--no-report", "-p", crate, "--all-features",
                 "--profile", "ci",
+                "--no-tests=pass",
             ]
         else:
             cmd = [
                 "cargo", "nextest", "run",
                 "-p", crate, "--all-features",
                 "--profile", "ci",
+                "--no-tests=pass",
             ]
         result = subprocess.run(cmd)
 
@@ -155,7 +157,12 @@ def run_group_tests(args):
             failed.append(crate)
             github_error(f"Test failed for {crate} on {args.os}")
 
-    github_output("junit_dir", str(junit_dir))
+    junit_files = sorted(junit_dir.glob("junit-*.xml"))
+    if junit_files:
+        github_output(
+            "junit_files",
+            ",".join(str(f).replace("\\", "/") for f in junit_files),
+        )
 
     if failed:
         print("\n" + "=" * 40)

.github/workflows/build-and-test.yml

@@ -89,10 +89,10 @@ jobs:
           fail_ci_if_error: true
 
       - name: Upload test results to Codecov
-        if: ${{ !cancelled() }}
+        if: ${{ !cancelled() && steps.tests.outputs.junit_files }}
         uses: codecov/test-results-action@v1
         with:
-          files: target/test-results/junit-*.xml
+          files: ${{ steps.tests.outputs.junit_files }}
           flags: ${{ matrix.group }}
           token: ${{ secrets.CODECOV_TOKEN }}