ci: Update Steam Linux Runtime tasks.

- Use "3.0" instead of "Sniper"
- Use "steamrt3" instead of "slrsniper"
- Use latest instead of beta for x86_64

.github/workflows/create-test-plan.py

@@ -113,8 +113,8 @@ JOB_SPECS = {
     "msvc-gdk-x64": JobSpec(name="GDK (MSVC, x64)",                         os=JobOs.WindowsLatest,     platform=SdlPlatform.Msvc,        artifact="SDL-VC-GDK",             msvc_arch=MsvcArch.X64,   msvc_project="VisualC-GDK/SDL.sln", gdk=True, no_cmake=True, ),
     "ubuntu-22.04": JobSpec(name="Ubuntu 22.04",                            os=JobOs.Ubuntu22_04,       platform=SdlPlatform.Linux,       artifact="SDL-ubuntu22.04", ),
     "ubuntu-24.04-arm64": JobSpec(name="Ubuntu 24.04 (ARM64)",              os=JobOs.Ubuntu24_04_arm,   platform=SdlPlatform.Linux,       artifact="SDL-ubuntu24.04-arm64", ),
-    "steamrt-sniper": JobSpec(name="Steam Linux Runtime (Sniper)",          os=JobOs.UbuntuLatest,      platform=SdlPlatform.Linux,       artifact="SDL-slrsniper",          container="registry.gitlab.steamos.cloud/steamrt/sniper/sdk:beta", ),
-    "steamrt-sniper-arm64": JobSpec(name="Steam Linux Runtime (arm64)",     os=JobOs.Ubuntu24_04_arm,   platform=SdlPlatform.Linux,       artifact="SDL-slrsniper-arm64",    container="registry.gitlab.steamos.cloud/steamrt/sniper/sdk/arm64:3.0.20250408.124536", ),
+    "steamrt3": JobSpec(name="Steam Linux Runtime 3.0 (x86_64)",            os=JobOs.UbuntuLatest,      platform=SdlPlatform.Linux,       artifact="SDL-steamrt3",           container="registry.gitlab.steamos.cloud/steamrt/sniper/sdk:latest", ),
+    "steamrt3-arm64": JobSpec(name="Steam Linux Runtime 3.0 (arm64)",       os=JobOs.Ubuntu24_04_arm,   platform=SdlPlatform.Linux,       artifact="SDL-steamrt3-arm64",     container="registry.gitlab.steamos.cloud/steamrt/sniper/sdk/arm64:3.0.20250408.124536", ),
     "ubuntu-intel-icx": JobSpec(name="Ubuntu 22.04 (Intel oneAPI)",         os=JobOs.Ubuntu22_04,       platform=SdlPlatform.Linux,       artifact="SDL-ubuntu22.04-oneapi", intel=IntelCompiler.Icx, ),
     "ubuntu-intel-icc": JobSpec(name="Ubuntu 22.04 (Intel Compiler)",       os=JobOs.Ubuntu22_04,       platform=SdlPlatform.Linux,       artifact="SDL-ubuntu22.04-icc",    intel=IntelCompiler.Icc, ),
     "macos-framework-x64":  JobSpec(name="MacOS (Framework) (x64)",         os=JobOs.Macos13,           platform=SdlPlatform.MacOS,       artifact="SDL-macos-framework",    apple_framework=True,  apple_archs={AppleArch.Aarch64, AppleArch.X86_64, }, xcode=True, ),