Split timing out GCC 15 job

Author: pdimov

.github/workflows/ci.yml

@@ -89,12 +89,44 @@ jobs:
             os: ubuntu-latest
             install: g++-14-multilib
             address-model: 32,64
+
           - toolset: gcc-15
-            cxxstd: "11,14,17,20,23,2c"
+            cxxstd: "11"
+            container: ubuntu:25.10
+            os: ubuntu-latest
+            install: g++-15-multilib
+            address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "14"
             container: ubuntu:25.10
             os: ubuntu-latest
             install: g++-15-multilib
             address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "17"
+            container: ubuntu:25.10
+            os: ubuntu-latest
+            install: g++-15-multilib
+            address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "20"
+            container: ubuntu:25.10
+            os: ubuntu-latest
+            install: g++-15-multilib
+            address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "23"
+            container: ubuntu:25.10
+            os: ubuntu-latest
+            install: g++-15-multilib
+            address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "2c"
+            container: ubuntu:25.10
+            os: ubuntu-latest
+            install: g++-15-multilib
+            address-model: 32,64
+
           - toolset: clang
             compiler: clang++-3.9
             cxxstd: "11,14"