ci: Migrate the remaining jobs to an alternative CI runner

[gerhard]

We have been hitting networking issues in AWS, this should address them and also speed things up.

Also, use the platform cache across the SDK jobs since it seems to speed each job up by a good few minutes.

[jedevc]

nit: we should allow this to be nil, and handle that in splitTests.

[gerhard]

I tried this, and the explicit &dagger.GhaJobOpts{} felt more honest & easier to follow for me.

It also made it easier to know what type that nil was keeping the place of. Adding extra properties was also easier - the type was already there.

Adding the diff here for completeness, but the current implementation feels right to me:

diff --git a/.github/main.go b/.github/main.go
index f0e320861..7d6a9a908 100644
--- a/.github/main.go
+++ b/.github/main.go
@@ -197,19 +197,19 @@ func (ci *CI) withTestWorkflows(runner *dagger.Gha, name string) *CI {
 			Runner: AltBronzeRunnerWithCache(),
 		})).
 		With(splitTests(runner, "testdev-", true, []testSplit{
-			{"cgroupsv2", []string{"TestProvision", "TestTelemetry"}, &dagger.GhaJobOpts{}},
+			{"cgroupsv2", []string{"TestProvision", "TestTelemetry"}, nil},
 			{"modules", []string{"TestModule"}, &dagger.GhaJobOpts{
 				Runner: AltPlatinumRunner(),
 			}},
 			{"module-runtimes", []string{"TestGo", "TestPython", "TestTypescript", "TestElixir", "TestPHP", "TestJava"}, &dagger.GhaJobOpts{
 				Runner: AltPlatinumRunner(),
 			}},
-			{"container", []string{"TestContainer"}, &dagger.GhaJobOpts{}},
-			{"LLM", []string{"TestLLM"}, &dagger.GhaJobOpts{}},
-			{"cli-engine", []string{"TestCLI", "TestEngine"}, &dagger.GhaJobOpts{}},
-			{"client-generator", []string{"TestClientGenerator"}, &dagger.GhaJobOpts{}},
-			{"interface", []string{"TestInterface"}, &dagger.GhaJobOpts{}},
-			{"call-and-shell", []string{"TestCall", "TestShell", "TestDaggerCMD"}, &dagger.GhaJobOpts{}},
+			{"container", []string{"TestContainer"}, nil},
+			{"LLM", []string{"TestLLM"}, nil},
+			{"cli-engine", []string{"TestCLI", "TestEngine"}, nil},
+			{"client-generator", []string{"TestClientGenerator"}, nil},
+			{"interface", []string{"TestInterface"}, nil},
+			{"call-and-shell", []string{"TestCall", "TestShell", "TestDaggerCMD"}, nil},
 			{"everything-else", nil, &dagger.GhaJobOpts{
 				Runner: AltPlatinumRunner(),
 			}},
@@ -239,12 +239,16 @@ func splitTests(runner *dagger.Gha, name string, dev bool, splits []testSplit) d
 			}
 			doneTests = append(doneTests, split.tests...)
 
-			opts := *split.opts
+			opts := dagger.GhaJobOpts{}
+			if split.opts != nil {
+				opts = *split.opts
+			}
 			opts.TimeoutMinutes = 30
 			opts.UploadLogs = true
 			if dev {
 				opts.DaggerVersion = "."
 			}
+
 			w = w.WithJob(runner.Job(name+split.name, command, opts))
 		}
 		return w