Update mssql.yml with Copilot suggestion

First sed: Changes HTTP to HTTPS in the repository URL (more secure and sometimes required)
Second sed: Adds the [signed-by=/usr/share/keyrings/microsoft-prod.gpg] directive to tell apt which keyring to use for verifying packages
This ensures apt can properly verify the Microsoft repository packages using the keyring you stored in the first curl command.

Author: rossaddison

.github/workflows/mssql.yml

@@ -60,6 +60,8 @@ jobs:
         run: |
           curl -fsSL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor | sudo tee /usr/share/keyrings/microsoft-prod.gpg > /dev/null
           curl -fsSL https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/prod.list | sudo tee /etc/apt/sources.list.d/mssql-release.list
+          sudo sed -i 's|http://|https://|g' /etc/apt/sources.list.d/mssql-release.list
+          sudo sed -i '$ s|$| [signed-by=/usr/share/keyrings/microsoft-prod.gpg]|' /etc/apt/sources.list.d/mssql-release.list
           sudo apt-get update
           sudo ACCEPT_EULA=Y apt-get install -y msodbcsql${{ matrix.mssql.odbc-version }}
       - name: Checkout