Add github extensions (from godot template)

.github/actions/build/action.yml

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+name: GDExtension Build
+description: Build GDExtension
+
+inputs:
+  platform:
+    required: true
+    description: Target platform.
+  arch:
+    required: true
+    description: Target architecture.
+  float-precision:
+    default: 'single'
+    description: Float precision (single or double).
+  build-target-type:
+    default: 'template_debug'
+    description: Build type (template_debug or template_release).
+  scons-cache:
+    default: .scons-cache/
+    description: Scons cache location.
+  em_version:
+    default: 3.1.39
+    description: Emscripten version.
+  em_cache_folder:
+    default: emsdk-cache
+    description: Emscripten cache folder.
+
+runs:
+  using: composite
+  steps:
+# Linux only
+    - name: Linux - dependencies
+      if: ${{ inputs.platform == 'linux' }}
+      shell: sh
+      run: |
+        sudo apt-get update -qq
+        sudo apt-get install -qqq build-essential pkg-config
+# Windows only
+    - name: Windows - Setup MinGW for Windows/MinGW build
+      uses: egor-tensin/setup-mingw@v2
+      if: ${{ inputs.platform == 'windows' }}
+      with:
+        version: 12.2.0
+# Dependencies of godot
+    # Use python 3.x release (works cross platform)
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v4
+      with:
+        # Semantic version range syntax or exact version of a Python version
+        python-version: "3.x"
+        # Optional - x64 or x86 architecture, defaults to x64
+        architecture: "x64"
+    - name: Setup scons
+      shell: bash
+      run: |
+        python -c "import sys; print(sys.version)"
+        python -m pip install scons==4.4.0
+        scons --version
+# Build
+    - name: Cache .scons_cache
+      uses: actions/cache@v3
+      with:
+        path: |
+          ${{ github.workspace }}/${{ inputs.gdextension-location }}/${{ inputs.scons-cache }}/
+          ${{ github.workspace }}/${{ inputs.godot-cpp }}/${{ inputs.scons-cache }}/
+        key: ${{ inputs.platform }}_${{ inputs.arch }}_${{ inputs.float-precision }}_${{ inputs.build-target-type }}_cache
+# Build godot-cpp
+    - name: Build godot-cpp Debug Build
+      shell: sh
+      env:
+        SCONS_CACHE: ${{ github.workspace }}/${{ inputs.godot-cpp }}/${{ inputs.scons-cache }}/
+      run: |
+        scons target=${{ inputs.build-target-type }} platform=${{ inputs.platform }} arch=${{ inputs.arch }} generate_bindings=yes precision=${{ inputs.float-precision }}
+      working-directory: ${{ inputs.godot-cpp }}
+# Build gdextension
+    - name: Build GDExtension Debug Build
+      shell: sh
+      env:
+        SCONS_CACHE: ${{ github.workspace }}/${{ inputs.gdextension-location }}/${{ inputs.scons-cache }}/
+      run: |
+        scons target=${{ inputs.build-target-type }} platform=${{ inputs.platform }} arch=${{ inputs.arch }} precision=${{ inputs.float-precision }} production=yes
+      working-directory: ${{ inputs.gdextension-location }}

.github/workflows/builds.yml

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+name: Build GDExtension
+on:
+  workflow_call:
+  push:
+
+env:
+  LIBNAME: example
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux
+            float-precision: double
+            arch: x86_64
+            os: ubuntu-20.04
+          - platform: windows
+            float-precision: double
+            arch: x86_64
+            os: windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+          fetch-depth: 0
+# Lint
+      #- name: Setup clang-format
+      #  shell: bash
+      #  run: |
+      #    python -m pip install clang-format
+      #- name: Run clang-format
+      #  shell: bash
+      #  run: |
+      #    clang-format src/** --dry-run --Werror
+# Build
+      - name: 🔗 GDExtension Build
+        uses: ./.github/actions/build
+        with:
+          platform: ${{ matrix.platform }}
+          arch: ${{ matrix.arch }}
+          float-precision: ${{ matrix.float-precision }}
+          build-target-type: template_release
+      - name: Windows - Delete compilation files
+        if: ${{ matrix.platform == 'windows' }}
+        shell: pwsh
+        run: |
+          Remove-Item bin/* -Include *.exp,*.lib,*.pdb -Force
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: godot-cpp-template
+          path: |
+            ${{ github.workspace }}/bin/**