ci/test-info.nix: read scenarios from github workflow file

Simplifies maintenance, both files no longer need to be kept in sync.

.github/workflows/test.yml

@@ -31,7 +31,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        scenario: [default, netns, netnsRegtest]
+        scenario:
+          - default
+          - netns
+          - netnsRegtest
     needs: build_test_drivers
     if: needs.build_test_drivers.outputs.run_scenario_tests == 'true'
     steps:

test/ci/test-info.nix

@@ -1,12 +1,19 @@
 pkgs: instantiateTests:
 
 let
+  scenarioNames = let
+    inherit (pkgs) lib;
+    workflowSrc = builtins.readFile ../../.github/workflows/test.yml;
+    matches = builtins.match ".*scenario:(([ \n]+-[ ]+[^ \n]+)+).*" workflowSrc;
+    scenariosStr = builtins.head matches;
+    particles = builtins.split "[ \n]+-[ ]+" scenariosStr;
+    # The first split particle is always an empty str
+    particles' = builtins.tail particles;
+  in
+    builtins.filter lib.isString particles';
+
   # `instantiateTests` prints the test name before evaluating, which is useful for debugging
-  ciTests = instantiateTests [
+  ciTests = instantiateTests scenarioNames;
-    "default"
-    "netns"
-    "netnsRegtest"
-  ];
   drivers = map (x: x.driver) ciTests;
   driverDrvs = map (x: ''"${x.drvPath}^*"'') drivers;
 in ''