Gitlab - CICD to Azure App Service with an application .NET Framework

Every development team has unique requirements that can make implementing an efficient deployment pipeline difficult on any cloud service. This is a process to prevents downtime: 

Here is CICD script:

variables:
MSBUILD: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\MSBuild\\Current\\Bin\\msbuild.exe"
SOLUTION: IProcessorSolution.sln
WEBJOB_PROJECT: ".\\IProcessorPdfParser\\IProcessorPdfParser.csproj"
DEV_PUBLISH_PROFILE: "IProcessorWebsiteStaging - Web Deploy"
DEV_PUBLISH_PROFILE_WEBJOB_PROJECT: "IProcessorWebsiteStaging - Web Deploy.pubxml"
DEV_DR_PUBLISH_PROFILE: "iprocessorwebsitestaging-dr - Web Deploy"
DEV_DR_PUBLISH_PROFILE_WEBJOB_PROJECT: "iprocessorwebsitestaging-dr - Web Deploy.pubxml"
PROD_DR_PUBLISH_PROFILE: "iprocessorwebsite-dr - Web Deploy"
PROD_DR_PUBLISH_PROFILE_WEBJOB_PROJECT: "iprocessorwebsite-dr - Web Deploy.pubxml"

stages:
- build
- deploy



deploy_dev_dr:
stage: deploy
environment:
name: staging
rules:
- if: $CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH != "dev" && $CI_COMMIT_BRANCH != "master"
tags:
- shared-windows
- windows
- windows-1809
script:
- 'nuget restore $SOLUTION'
- '& $MSBUILD $SOLUTION /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$DEV_DR_PUBLISH_PROFILE'
- '& $MSBUILD $WEBJOB_PROJECT /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$DEV_DR_PUBLISH_PROFILE_WEBJOB_PROJECT'
artifacts:
expire_in: 1 week

deploy_dev:
stage: deploy
environment:
name: staging
rules:
- if: $CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH == "dev"
tags:
- shared-windows
- windows
- windows-1809
script:
- 'nuget restore $SOLUTION'
- '& $MSBUILD $SOLUTION /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$DEV_PUBLISH_PROFILE'
- '& $MSBUILD $WEBJOB_PROJECT /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$DEV_PUBLISH_PROFILE_WEBJOB_PROJECT'
artifacts:
expire_in: 1 week


deploy_prod:
stage: deploy
environment:
name: production
rules:
- if: $CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH == "master"
tags:
- shared-windows
- windows
- windows-1809
script:
- 'nuget restore $SOLUTION'
- '& $MSBUILD $SOLUTION /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$PROD_DR_PUBLISH_PROFILE'
- '& $MSBUILD $WEBJOB_PROJECT /p:Configuration=Release /p:SignManifests=False /p:DeployOnBuild=true /p:PublishProfile=$PROD_DR_PUBLISH_PROFILE_WEBJOB_PROJECT'
artifacts:
expire_in: 1 week