Revert to build GDevelop.js in AppVeyor to see if signing works better

appveyor.yml

@@ -7,7 +7,11 @@ pull_requests:
   do_not_increment_build_number: true
 image: Visual Studio 2019
 clone_depth: 5
-# Build must be triggered by the API.
+# Only build
+branches:
+  only:
+    - master
+    - /experimental-build.*/
 skip_tags: true # Don't rebuild on tags.
 init:
   - ps: Install-Product node 16
@@ -18,12 +22,12 @@ cache:
   - newIDE\electron-app\node_modules -> newIDE\electron-app\package-lock.json
   - GDevelop.js\node_modules -> GDevelop.js\package-lock.json
 install:
-  # Download and install SSL.com eSigner CKA.
+  # Download and install SSL.com eSigner CKA. 
   # See https://www.ssl.com/how-to/how-to-integrate-esigner-cka-with-ci-cd-tools-for-automated-code-signing/.
   #
-  # This is necessary because of "signing to be FIPS-140 compliant". See
+  # This is necessary because of "signing to be FIPS-140 compliant". See 
   # https://github.com/electron-userland/electron-builder/issues/6158
-  #
+  # 
   # Make sure to DISABLE "malware blocker" in SSL.com to avoid errors like:
   # Error information: "Error: SignerSign() failed." (-2146893821/0x80090003)
   - ps: >-
@@ -38,13 +42,13 @@ install:
       Remove-Item eSigner_CKA_Setup.zip
 
       Move-Item -Destination "eSigner_CKA_Installer.exe" -Path "eSigner_CKA_*\*.exe"
-
+      
       # Install it. See https://www.ssl.com/how-to/how-to-integrate-esigner-cka-with-ci-cd-tools-for-automated-code-signing/
 
       New-Item -ItemType Directory -Force -Path "C:\projects\gdevelop\eSignerCKA"
 
       ./eSigner_CKA_Installer.exe /CURRENTUSER /VERYSILENT /SUPPRESSMSGBOXES /DIR="C:\projects\gdevelop\eSignerCKA" | Out-Null
-
+      
       # Disable logger.
 
       # $LogConfig = Get-Content -Path C:\projects\gdevelop\eSignerCKA/log4net.config
@@ -53,6 +57,23 @@ install:
 
       # $LogConfig | Set-Content -Path C:\projects\gdevelop\eSignerCKA/log4net.config
 
+  # Build GDevelop.js (and run tests to ensure it works).
+  # (in a subshell to avoid Emscripten polluting the Node.js and npm version for the rest of the build)
+  - cmd: >-
+      cd GDevelop.js
+
+      npm -v && npm install
+
+      git clone https://github.com/juj/emsdk.git
+
+      cd emsdk
+
+      emsdk install 3.1.21
+
+      CMD /C "emsdk activate 3.1.21 && cd .. && npm run build"
+
+      cd ..\..
+
   # Build GDevelop IDE.
   # Also install setuptools as something requires distutils in electron-app, and it was removed in Python 3.12.
   # setuptools will make distutils available again (but we should migrate our packages probably).