[CI] Refactor CI actions, use sub-actions, matrices.

.github/workflows/javascript_builds.yml

@@ -4,10 +4,13 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: 3.x
-  SCONSFLAGS: platform=javascript verbose=yes warnings=all werror=yes debug_symbols=no --jobs=2
-  SCONS_CACHE_LIMIT: 4096
+  SCONSFLAGS: verbose=yes warnings=all werror=yes debug_symbols=no
   EM_VERSION: 2.0.25
-  EM_CACHE_FOLDER: 'emsdk-cache'
+  EM_CACHE_FOLDER: "emsdk-cache"
+
+concurrency:
+  group: ci-${{github.actor}}-${{github.head_ref || github.run_number}}-${{github.ref}}-javascript
+  cancel-in-progress: true
 
 jobs:
   javascript-template:
@@ -17,26 +20,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      # Azure repositories are not reliable, we need to prevent azure giving us packages.
-      - name: Make apt sources.list use the default Ubuntu repositories
-        run: |
-          sudo rm -f /etc/apt/sources.list.d/*
-          sudo cp -f misc/ci/sources.list /etc/apt/sources.list
-          sudo apt-get update
-
-      # Upload cache on completion and check it out now
-      - name: Load .scons_cache directory
-        id: javascript-template-cache
-        uses: actions/cache@v2
-        with:
-          path: ${{github.workspace}}/.scons_cache/
-          key: ${{github.job}}-${{env.GODOT_BASE_BRANCH}}-${{github.ref}}-${{github.sha}}
-          restore-keys: |
-            ${{github.job}}-${{env.GODOT_BASE_BRANCH}}-${{github.ref}}-${{github.sha}}
-            ${{github.job}}-${{env.GODOT_BASE_BRANCH}}-${{github.ref}}
-            ${{github.job}}-${{env.GODOT_BASE_BRANCH}}
-        continue-on-error: true
-
       # Additional cache for Emscripten generated system libraries
       - name: Load Emscripten cache
         id: javascript-template-emscripten-cache
@@ -45,23 +28,6 @@ jobs:
           path: ${{env.EM_CACHE_FOLDER}}
           key: ${{env.EM_VERSION}}-${{github.job}}
 
-      # Use python 3.x release (works cross platform)
-      - name: Set up Python 3.x
-        uses: actions/setup-python@v2
-        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'
-
-      # You can test your matrix by printing the current Python version
-      - name: Configuring Python packages
-        run: |
-          python -c "import sys; print(sys.version)"
-          python -m pip install scons
-          python --version
-          scons --version
-
       - name: Set up Emscripten latest
         uses: mymindstorm/setup-emsdk@v10
         with:
@@ -72,15 +38,20 @@ jobs:
         run: |
           emcc -v
 
-      - name: Compilation
-        env:
-          SCONS_CACHE: ${{github.workspace}}/.scons_cache/
-        run: |
-          scons target=release tools=no use_closure_compiler=yes
-          ls -l bin/
+      - name: Setup Godot build cache
+        uses: ./.github/actions/godot-cache
+        continue-on-error: true
 
-      - uses: actions/upload-artifact@v2
+      - name: Setup python and scons
+        uses: ./.github/actions/godot-deps
+
+      - name: Compilation
+        uses: ./.github/actions/godot-build
         with:
-          name: ${{ github.job }}
-          path: bin/*
-          retention-days: 14
+          sconsflags: ${{ env.SCONSFLAGS }}
+          platform: javascript
+          target: release
+          tools: false
+
+      - name: Upload artifact
+        uses: ./.github/actions/upload-artifact