Add action and related CI

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: '${{ github.workflow }}-${{ github.ref_name }}'
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    name: CI
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-13]
+
+    runs-on: ${{matrix.os}}
+    container: ${{ matrix.os == 'ubuntu-latest' && 'ghcr.io/f3d-app/f3d-superbuild-ci' || null }}
+
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        path: 'source'
+        fetch-depth: 0
+
+    - name: Checkout HelloWorld
+      uses: actions/checkout@v4
+      with:
+        repository: f3d-app/HelloWorld
+        path: HelloWorld
+        ref: v2.0.1
+
+    - name: Install tools Windows
+      if: runner.os == 'Windows'
+      shell: cmd
+      run: choco install ninja
+
+    - name: Setup msvc Windows
+      if: runner.os == 'Windows'
+      uses: TheMrMilchmann/setup-msvc-dev@v3
+      with:
+        arch: x64
+
+    - name: Use sccache action
+      uses: ./source/
+      with:
+        key: MyKey-0
+
+    - name: Setup directories
+      working-directory: ${{github.workspace}}/HelloWorld
+      shell: bash
+      run: mkdir build
+
+    - name: Configure
+      working-directory: ${{github.workspace}}/HelloWorld/build
+      shell: bash
+      run: >
+        cmake ../
+        -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
+        -DCMAKE_C_COMPILER_LAUNCHER=sccache
+        ${{ runner.os == 'Windows' && '-G Ninja' || null }}
+
+    - name: Build
+      working-directory: ${{github.workspace}}/HelloWorld/build
+      shell: bash
+      run: cmake --build .
+
+    - name: Show and check sccache
+      shell: bash
+      run: |
+        sccache --show-stats
+        sccache --show-stats | grep "Compile requests executed" | grep 1 | grep ''

README.md

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 # sccache-setup-action
+
 A github action to install and setup sccache to speed up your builds
+
+It installs (on Windows using `choco` and on MacOS using `brew`), recover a cached sccache cache using the github cache action
+then setup and run a sccache server.
+
+On Linux, it assumes sccache is available.
+
+Example usage:
+
+```
+  - name: Install and setup sccache
+    uses: f3d-app/sccache-setup-action@v1
+    with:
+      key: MyKey-0
+```
+
+Then during the configuration of your build, add sccache as a launcher, eg, for CMake:
+
+```
+  - name: Configure
+    working-directory: ${{github.workspace}}/build
+    shell: bash
+    run: >
+      cmake ../source
+      -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
+      -DCMAKE_C_COMPILER_LAUNCHER=sccache
+```
+
+Resulting caches can be seen in your actions tab.
+
+To check the sccache action is behaving as expected, it is possible to add the following at the end of your job:
+
+```
+  - name: Stop and check sccache
+    shell: bash
+    run: sccache --show-stats
+```
+
+Please note sccache does not work with Visual Studio Generator on Windows but requires ninja-build in that case:
+https://github.com/mozilla/sccache/issues/957

action.yml

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+name: 'Install and Setup sccache'
+description: 'Install and setup sccache'
+branding:
+  icon: 'arrow-up'
+  color: 'green'
+inputs:
+  key:
+    description: 'Cache key to differentiate between caches'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+
+    - name: Install sccache Windows
+      if: runner.os == 'Windows'
+      shell: cmd
+      run: choco install sccache
+
+    - name: Install sccache MacOS
+      if: runner.os == 'macOS'
+      shell: bash
+      run: brew install sccache
+
+    - name: Initialize sccache environnement
+      shell: bash
+      run: |
+        sccache --start-server
+        echo SCCACHE_CACHE=$(sccache --show-stats | grep Local | cut -d '"' -f2) >> $GITHUB_ENV
+        echo DATE_STRING=$(date +'%Y%m%d') >> $GITHUB_ENV
+        sccache --stop-server
+
+    - name: Recover sccache cache
+      uses: actions/cache@v4
+      with:
+        path: ${{env.SCCACHE_CACHE}}
+        key: sccache-cache-${{inputs.key}}-${{env.DATE_STRING}}
+        restore-keys: sccache-cache-${{inputs.key}}
+
+    - name: Start sccache
+      shell: bash
+      run: sccache --start-server