Add a separate setup-godot-cpp github action.

Author: Ivorforce

.github/actions/setup-godot-cpp/action.yml

@@ -0,0 +1,59 @@
+name: Setup godot-cpp
+description: Setup build dependencies for godot-cpp.
+
+inputs:
+  platform:
+    required: true
+    description: Target platform.
+  em-version:
+    default: 3.1.62
+    description: Emscripten version.
+  windows-use-mingw:
+    description: 'Set to true to use MinGW, false otherwise'
+    required: true
+    default: 'false'
+    type: boolean
+  mingw-version:
+    default: 12.2.0
+    description: MinGW version.
+  ndk-version:
+    default: r23c
+    description: Android NDK version.
+  scons-version:
+    default: 4.4.0
+    description: SCons version.
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Python (for SCons)
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.x
+
+    - name: Setup Android dependencies
+      if: inputs.platform == 'android'
+      uses: nttld/setup-ndk@v1
+      with:
+        ndk-version: ${{ inputs.ndk-version }}
+        link-to-sdk: true
+
+    - name: Setup Web dependencies
+      if: inputs.platform == 'web'
+      uses: mymindstorm/setup-emsdk@v14
+      with:
+        version: ${{ inputs.em-version }}
+        no-cache: true
+
+    - name: Setup MinGW for Windows/MinGW build
+      if: inputs.platform == 'windows' && inputs.windows-use-mingw
+      uses: egor-tensin/setup-mingw@v2
+      with:
+        version: ${{ inputs.mingw-version }}
+
+    - name: Setup SCons
+      shell: bash
+      run: |
+        python -c "import sys; print(sys.version)"
+        python -m pip install scons==${{ inputs.scons-version }}
+        scons --version

.github/workflows/ci.yml

@@ -108,34 +108,11 @@ jobs:
           cache-name: ${{ matrix.cache-name }}
         continue-on-error: true
 
-      - name: Set up Python (for SCons)
-        uses: actions/setup-python@v5
+      - name: Setup godot-cpp
+        uses: ./.github/actions/setup-godot-cpp
         with:
-          python-version: 3.x
-
-      - name: Android dependencies
-        if: matrix.platform == 'android'
-        uses: nttld/setup-ndk@v1
-        with:
-          ndk-version: r23c
-          link-to-sdk: true
-
-      - name: Web dependencies
-        if: matrix.platform == 'web'
-        uses: mymindstorm/setup-emsdk@v14
-        with:
-          version: ${{ env.EM_VERSION }}
-          no-cache: true
-
-      - name: Setup MinGW for Windows/MinGW build
-        if: matrix.platform == 'windows' && matrix.flags == 'use_mingw=yes'
-        uses: egor-tensin/setup-mingw@v2
-        with:
-          version: 12.2.0
-
-      - name: Install scons
-        run: |
-          python -m pip install scons==4.0.0
+          platform: ${{ matrix.platform }}
+          windows-use-mingw: ${{ matrix.flags == 'use_mingw=yes' }}
 
       - name: Generate godot-cpp sources only
         run: |