ci: configure Flux Pro authentication in GitHub Actions workflow

Author: Muetze42

.github/workflows/tests.yml

@@ -58,6 +58,9 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
+      - name: Configure Flux Pro authentication
+        run: composer config http-basic.composer.fluxui.dev "${{ secrets.FLUX_USERNAME }}" "${{ secrets.FLUX_LICENSE_KEY }}"
+
       - name: Install Composer dependencies
         run: composer install --no-interaction --prefer-dist --optimize-autoloader
 
@@ -165,6 +168,9 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
+      - name: Configure Flux Pro authentication
+        run: composer config http-basic.composer.fluxui.dev "${{ secrets.FLUX_USERNAME }}" "${{ secrets.FLUX_LICENSE_KEY }}"
+
       - name: Install Composer dependencies
         run: composer install --no-interaction --prefer-dist --optimize-autoloader