[ci] Add workflow to configure with CMake 3.15

Ensure that oldest supportest version of CMake can configure project
Copy quick_cmake from CLIUtils/CLI11

Author: gruenich

.github/actions/quick_cmake/action.yml

@@ -0,0 +1,25 @@
+name: Quick CMake config
+description: "Runs CMake 3.14+ (if already setup)"
+inputs:
+  args:
+    description: "Other arguments"
+    required: false
+    default: ""
+  cmake-version:
+    description: "The CMake version to run"
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: CMake ${{ inputs.cmake-version }}
+      uses: jwlawson/actions-setup-cmake@v2.2
+      with:
+        cmake-version: "${{ inputs.cmake-version }}"
+    - run: |
+        mkdir -p build-tmp
+        touch build-tmp/tmp
+        rm -r build-tmp/*
+        (cd build-tmp && cmake .. ${{ inputs.args }})
+        rm -r build-tmp
+      shell: bash

.github/workflows/build.yml

@@ -104,6 +104,18 @@ jobs:
               --config ${{ env.CMAKE_BUILD_TYPE }} \
               --verbose
 
+  cmake-config-oldest-cmake:
+    name: CMake 3.15 config check (Ubuntu 26.04)
+    runs-on: ubuntu-26.04
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check CMake 3.15
+        uses: ./.github/actions/quick_cmake
+        with:
+          cmake-version: "3.15"
+        if: success() || failure()
+
   bazel-build:
       strategy:
         matrix: