update github workflow

Author: eug-L

.github/workflows/release.yml

@@ -19,6 +19,7 @@ jobs:
             ./vendor
             ./prestashop1.6/vendor
             ./prestashop1.7/vendor
+            ./prestashop8.x/vendor
           # the key will change if composer.lock changes
           key: ${{ runner.os }}-dependencies-${{ hashFiles('**/composer.lock') }}
 
@@ -33,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ps_version: ['1.6', '1.7']
+        ps_version: ['1.6', '1.7', '8.x']
     steps:
       - name: checkout
         uses: actions/checkout@v2
@@ -46,6 +47,7 @@ jobs:
             ./vendor
             ./prestashop1.6/vendor
             ./prestashop1.7/vendor
+            ./prestashop8.x/vendor
           # the key will change if composer.lock changes
           key: ${{ runner.os }}-dependencies-${{ hashFiles('**/composer.lock') }}