AZ-400 decision sheets

• Azure Artifacts feed views: publish, promote and resolution order
• Bicep vs ARM JSON vs Terraform for Azure infrastructure as code
• Azure Boards and GitHub linking: '#N' vs 'AB#N'
• Service hooks vs notification subscriptions vs the Teams app vs Office 365 Connectors
• GitHub Secret Protection vs Code Security vs Dependabot vs Defender for Cloud
• GitHub flow: what a merge into the default branch actually triggers
• Managed identity vs service principal vs GITHUB_TOKEN vs OIDC federation