GHA: Build with ios_simulator=yes flag

.github/workflows/gdextension.yml

@@ -179,6 +179,7 @@ jobs:
             platform: ios
             target: template_release
             arch: universal
+            scons-flags: ios_simulator=yes
             should-build: ${{ !inputs.test-build }}
 
           - name: 🍏 iOS (simulator, debug)
@@ -186,6 +187,7 @@ jobs:
             platform: ios
             target: template_debug
             arch: universal
+            scons-flags: ios_simulator=yes
             should-build: ${{ !inputs.test-build }}
 
         exclude:
@@ -300,7 +302,7 @@ jobs:
           SCONS_CACHE: ${{github.workspace}}/.scons_cache/
         run: |
           PATH=${GITHUB_WORKSPACE}/buildroot/bin:$PATH
-          scons platform=${{matrix.opts.platform}} target=${{matrix.opts.target}} arch=${{matrix.opts.arch}} ${{env.SCONSFLAGS}}
+          scons platform=${{matrix.opts.platform}} target=${{matrix.opts.target}} arch=${{matrix.opts.arch}} ${{matrix.opts.scons-flags}} ${{env.SCONSFLAGS}}
 
       - name: Prepare artifact
         shell: bash