Add Azure pipeline config

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

.azure-pipelines/build.yml

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+parameters:
+- name: 'arch'
+  type: string
+- name: 'pool'
+  type: object
+  default: {}
+- name: 'containerImage'
+  type: string
+- name: 'codeCoverage'
+  type: boolean
+  default: false
+
+jobs:
+- job:
+  displayName: ${{ parameters.arch }}
+  timeoutInMinutes: 60
+  pool: ${{ parameters.pool }}
+
+  container:
+    image: ${{ parameters.containerImage }}
+
+  steps:
+  - ${{ if and(eq(parameters.arch, 'amd64'), parameters.codeCoverage) }}:
+    - script: |
+        wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+        sudo dpkg -i packages-microsoft-prod.deb
+        rm packages-microsoft-prod.deb
+        sudo apt-get update
+        sudo apt-get install -y apt-transport-https
+        sudo apt-get install -y dotnet-sdk-6.0
+      displayName: install .Net
+  - script: |
+      sudo apt-get install -y \
+          libboost-system-dev \
+          libboost-thread-dev \
+          googletest \
+          libgtest-dev \
+          libgmock-dev \
+          libhiredis-dev \
+          libnl-3-dev \
+          libnl-route-3-dev \
+          libnl-genl-3-dev \
+          libnl-nf-3-dev
+
+    displayName: "Install dependencies"
+  - checkout: self
+    clean: true
+    submodules: true
+  - task: DownloadPipelineArtifact@2
+    inputs:
+      source: specific
+      project: build
+      pipeline: 9
+      ${{ if eq(parameters.arch, 'amd64') }}:
+        artifact: sonic-swss-common
+      ${{ else }}:
+        artifact: sonic-swss-common.${{ parameters.arch }}
+      runVersion: 'latestFromBranch'
+      runBranch: 'refs/heads/master'
+      path: '$(Build.SourcesDirectory)/sonic-swss-common'
+    displayName: "Download sonic swss common deb packages"
+  - script: |
+        sudo dpkg -i sonic-swss-common/libswsscommon_1.0.0_${{ parameters.arch }}.deb
+        sudo dpkg -i sonic-swss-common/libswsscommon-dev_1.0.0_${{ parameters.arch }}.deb
+    displayName: "Install sonic swss common"
+  - script: |
+      rm ../*.deb
+      dpkg-buildpackage -us -uc -b -j$(nproc)
+      cp ../*.deb $(Build.ArtifactStagingDirectory)
+    displayName: "Compile sonic dhcp-relay"
+  - publish: $(Build.ArtifactStagingDirectory)
+    artifact: sonic-dhcp-relay.${{ parameters.arch }}
+    displayName: "Archive dhcp-relay debian packages"
+  - ${{ if and(eq(parameters.arch, 'amd64'), parameters.codeCoverage) }}:
+    - task: PublishCodeCoverageResults@1
+      inputs:
+        summaryFileLocation: dhcprelay-test-result.xml
+        pathToSources: $(Build.SourcesDirectory)
+        codeCoverageTool: 'Cobertura'

azure-pipelines.yml

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+# C/C++ with GCC
+# Build your C/C++ project with GCC using make.
+# Add steps that publish test results, save build artifacts, deploy, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/apps/c-cpp/gcc
+
+trigger:
+  branches:
+    include:
+      - "*"
+
+jobs:
+- template: .azure-pipelines/build.yml
+  parameters:
+    arch: amd64
+    pool:
+      vmImage: 'ubuntu-20.04'
+    codeCoverage: false
+    containerImage: sonicdev-microsoft.azurecr.io:443/sonic-slave-bullseye:latest
+- template: .azure-pipelines/build.yml
+  parameters:
+    arch: arm64
+    pool: sonicbld-arm64
+    containerImage: sonicdev-microsoft.azurecr.io:443/sonic-slave-bullseye-arm64:latest
+- template: .azure-pipelines/build.yml
+  parameters:
+    arch: armhf
+    pool: sonicbld-armhf
+    containerImage: sonicdev-microsoft.azurecr.io:443/sonic-slave-bullseye-armhf:latest
+

azurepipelines-coverage.yml

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+coverage:
+  status:           # Code coverage status will be posted to pull requests based on targets defined below.
+    comments: on    # Off by default. When on, details about coverage for each file changed will be posted as a pull request comment. 
+    diff:           # Diff coverage is code coverage only for the lines changed in a pull request.
+      target: 60%   # Set this to a desired percentage. Default is 70 percent