ci: backport jobs from main

.github/workflows/amd64_linux_cmake_python.yml

@@ -1,77 +1,132 @@
 # ref: https://github.com/actions/runner-images
 name: amd64 Linux CMake Python
 
-on: [push, pull_request, workflow_dispatch]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
 
 concurrency:
   group: ${{github.workflow}}-${{github.ref}}
   cancel-in-progress: true
 
 # Building using the github runner environement directly.
+env:
+  CCACHE_BASEDIR: ${{github.workspace}}
+  CCACHE_DIR: ${{github.workspace}}/.ccache
+
 jobs:
   native:
     strategy:
       matrix:
-        cmake: [
-          {name: "Make", generator: "Unix Makefiles", config: Release},
-          {name: "Ninja", generator: "Ninja", config: Release},
-          {name: "Ninja Multi", generator: "Ninja Multi-Config", config: Release},
-        ]
         python: [
           {version: "3.9"},
-          {version: "3.10"},
-          {version: "3.11"},
-          {version: "3.12"},
+          #{version: "3.10"},
+          #{version: "3.11"},
+          #{version: "3.12"},
           {version: "3.13"},
-        ]
+         ]
       fail-fast: false
-    name: amd64•Linux•CMake(${{matrix.cmake.name}})•Python-${{matrix.python.version}}
+    name: amd64•Linux•CMake•Python${{matrix.python.version}}
     runs-on: ubuntu-latest
+    env:
+      deps_src_key: amd64_linux_python_deps_src_${{matrix.python.version}}
+      deps_build_key: amd64_linux_python_deps_build_${{matrix.python.version}}
+      ccache_key: amd64_linux_python_ccache_${{matrix.python.version}}
     steps:
       - uses: actions/checkout@v5
-      - name: Install Ninja
+      - name: Install Dependencies
         run: |
           sudo apt update
-          sudo apt install -y ninja-build
-      - name: Swig install
-        run: |
-          sudo apt install -y swig
+          sudo apt install -y ninja-build ccache swig
           swig -version
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{matrix.python.version}}
       - name: Update Path
         run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      # RESTORING CACHES
+      - name: Restore CMake dependency source code
+        uses: actions/cache/restore@v4
+        id: deps_src_restore
+        with:
+          key: ${{env.deps_src_key}}-${{hashFiles('CMakeLists.txt', 'cmake/**')}}
+          path: ${{github.workspace}}/build/_deps/*-src
+      - name: Restore CMake dependency build
+        uses: actions/cache/restore@v4
+        id: deps_build_restore
+        with:
+          key: ${{env.deps_build_key}}-${{hashFiles('CMakeLists.txt', 'cmake/**')}}
+          path: |
+            ${{github.workspace}}/build/_deps/*-build
+            ${{github.workspace}}/build/_deps/*-subbuild
+      - name: Restore CCache
+        uses: actions/cache/restore@v4
+        id: ccache_restore
+        with:
+          key: ${{env.ccache_key}}-${{github.sha}}
+          restore-keys: ${{env.ccache_key}}-
+          path: ${{env.CCACHE_DIR}}
+
       - name: Check CMake
         run: cmake --version
       - name: Configure
         run: >
           cmake -S. -Bbuild
-          -G "${{matrix.cmake.generator}}"
-          -DCMAKE_BUILD_TYPE=${{matrix.cmake.config}}
+          -G "Ninja"
+          -DCMAKE_BUILD_TYPE=Release
           -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
           -DBUILD_PYTHON=ON
           -DCMAKE_INSTALL_PREFIX=install
       - name: Build
         run: >
           cmake --build build
-          --config ${{matrix.cmake.config}}
+          --config Release
           --target all
           -v -j2
       - name: Test
         run: >
           CTEST_OUTPUT_ON_FAILURE=1
           cmake --build build
-          --config ${{matrix.cmake.config}}
+          --config Release
           --target test
           -v
       - name: Install
         run: >
           cmake --build build
-          --config ${{matrix.cmake.config}}
+          --config Release
           --target install
           -v
+      - name: CCache stats
+        run: |
+          ccache --show-stats
+          ccache --zero-stats
+
+      # SAVING CACHES
+      - name: Save CCache
+        if: github.ref == 'refs/heads/main'
+        uses: actions/cache/save@v4
+        with:
+          key: ${{steps.ccache_restore.outputs.cache-primary-key}}
+          path: ${{env.CCACHE_DIR}}
+      - name: Save CMake dependency build
+        if: github.ref == 'refs/heads/main'
+        uses: actions/cache/save@v4
+        with:
+          key: ${{steps.deps_build_restore.outputs.cache-primary-key}}
+          path: |
+            ${{github.workspace}}/build/_deps/*-build
+            ${{github.workspace}}/build/_deps/*-subbuild
+      - name: Save CMake dependency source code
+        if: github.ref == 'refs/heads/main'
+        uses: actions/cache/save@v4
+        with:
+          key: ${{steps.deps_src_restore.outputs.cache-primary-key}}
+          path: ${{github.workspace}}/build/_deps/*-src
 
   amd64_linux_cmake_python:
     runs-on: ubuntu-latest