add godot build

.github/actions/godot-build/action.yml

@@ -0,0 +1,51 @@
+name: Build Godot
+description: Build Godot with the provided options.
+defaults:
+  run:
+    working-directory: ./godot-engine
+inputs:
+  target:
+    description: Build target (editor, template_release, template_debug).
+    default: "editor"
+  tests:
+    description: Unit tests.
+    default: false
+  platform:
+    description: Target platform.
+    required: false
+  sconsflags:
+    default: ""
+  scons-cache:
+    description: The scons cache path.
+    default: "${{ github.workspace }}/.scons-cache/"
+  scons-cache-limit:
+    description: The scons cache size limit.
+    # actions/cache has 10 GiB limit, and GitHub runners have a 14 GiB disk.
+    # Limit to 7 GiB to avoid having the extracted cache fill the disk.
+    default: 7168
+runs:
+  using: "composite"
+  steps:
+    - name: Scons Build
+      shell: sh
+      env:
+          SCONSFLAGS: ${{ inputs.sconsflags }}
+          SCONS_CACHE: ${{ inputs.scons-cache }}
+          SCONS_CACHE_LIMIT: ${{ inputs.scons-cache-limit }}
+      run: |
+        echo "Building with flags:" platform=${{ inputs.platform }} target=${{ inputs.target }} tests=${{ inputs.tests }} ${{ env.SCONSFLAGS }}
+
+        if [ "${{ inputs.target }}" != "editor" ]; then
+          # Ensure we don't include editor code in export template builds.
+          rm -rf editor
+        fi
+
+        if [ "${{ github.event.number }}" != "" ]; then
+          # Set build identifier with pull request number if available. This is displayed throughout the editor.
+          export BUILD_NAME="gh-${{ github.event.number }}"
+        else
+          export BUILD_NAME="gh"
+        fi
+
+        scons platform=${{ inputs.platform }} target=${{ inputs.target }} tests=${{ inputs.tests }} ${{ env.SCONSFLAGS }}
+        ls -l bin/