test: threadpoolexecutor without ci matrix

.github/workflows/build.yml

@@ -3,14 +3,11 @@ name: "Generate test artifacts"
 on:
   pull_request:
     types: [opened, reopened, synchronize]
+
 jobs:
   build:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        theme: [mocha, macchiato, frappe, latte]
-
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -23,15 +20,19 @@ jobs:
           cache: "pip"
 
       - name: Install dependencies
-        run: |
-          sudo apt update
-          sudo apt install -y sassc inkscape optipng
-          pip install -r requirements.txt
+        run: pip install -r requirements.txt
 
-      - name: Generate theme
+      - name: Install colloid specific dependencies
+        run: sudo apt update && sudo apt install -y sassc inkscape optipng
+
+      - name: Generate themes
         run: |
           python patches/xfwm4/generate_assets.py
-          python ./build.py ${{ matrix.theme }} --all-accents --zip -d $PWD/releases
+
+          python ./build.py mocha --all-accents --zip -d $PWD/releases &&
+          python ./build.py macchiato --all-accents --zip -d $PWD/releases &&
+          python ./build.py frappe --all-accents --zip -d $PWD/releases &&
+          python ./build.py latte --all-accents --zip -d $PWD/releases
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4