Update main.yml

Author: patricia-gallardo

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-18.04, ubuntu-20.04, macos-10.15, windows-2019]
 
     runs-on: ${{ matrix.os }}
 
@@ -25,7 +25,7 @@ jobs:
           bot_name: ${{ secrets.BOT_NAME }}
           bot_token: ${{ secrets.BOT_TOKEN }}
           cache_name: turtlebrowser/conan-cache-turtlebrowser
-          key: test_${{ runner.os }}-${{ hashFiles('restore.sh') }}-${{ hashFiles('save.sh') }}
+          key: test_${{ runner.os }}-${{ hashFiles('restore.sh') }}-${{ hashFiles('save.sh') }}-2
           target_os: Test
           lfs_limit: 60