Update dotnet.yml

Author: IgorBuchelnikov

.github/workflows/dotnet.yml

@@ -10,11 +10,17 @@ jobs:
   build:
 
     # runs-on: self-hosted
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 4320
 
     steps:
     - uses: actions/checkout@v2
+    - name: Install OpenSSL 1.1
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ca-certificates
+        sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu focal-security main"
+        sudo apt-get install -y libssl1.1 libssl-dev
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with: