Update .NET 9.0 rc1, remove alpine3.19 (#15) * Remove alpine3.19 (6.0-alpine3.19, 8.0-alpine3.19) * Switch to .NET 9.0 RC * Add azurelinux3.0: 8.0-azurelinux3.0 and 9.0-azurelinux3.0 * Add azurelinux3.0: 8.0-azurelinux3.0 and 9.0-azurelinux3.0 * Drop azurelinux3.0, as not package installation yet