Cherry-pick PRs in master branch to unblock PR checks.

.azure-pipelines/build-sairedis-template.yml

@@ -58,6 +58,8 @@ jobs:
       git status
     displayName: Set up sonic-sairedis branch
   - script: |
+      set -ex
+      sudo apt-get update
       sudo apt-get install -qq -y \
         qtbase5-dev \
         libdbus-glib-1-2 \

.azure-pipelines/build-swss-template.yml

@@ -58,6 +58,8 @@ jobs:
       git status
     displayName: Set up sonic-swss branch
   - script: |
+      set -ex
+      sudo apt-get update
       sudo apt-get install -y libhiredis0.14 libhiredis-dev
       sudo apt-get install -y libzmq5 libzmq3-dev
       sudo apt-get install -qq -y \

.azure-pipelines/build-template.yml

@@ -55,6 +55,8 @@ jobs:
   - checkout: self
     clean: true
   - script: |
+      set -ex
+      sudo apt-get update
       sudo apt-get install -qq -y \
         libhiredis-dev \
         libnl-3-dev \

.azure-pipelines/build_and_install_module.sh

@@ -26,6 +26,7 @@ function build_and_install_kmodule()
     SUBLEVEL=$(echo $KERNEL_MAINVERSION | cut -d. -f3)
 
     # Install the required debian packages to build the kernel modules
+    apt-get update
     apt-get install -y build-essential linux-headers-${KERNEL_RELEASE} autoconf pkg-config fakeroot
     apt-get install -y flex bison libssl-dev libelf-dev
     apt-get install -y libnl-route-3-200 libnl-route-3-dev libnl-cli-3-200 libnl-cli-3-dev libnl-3-dev

.azure-pipelines/test-docker-sonic-vs-template.yml

@@ -60,6 +60,8 @@ jobs:
       sudo py.test -v --force-flaky --junitxml=tr.xml --imgname=docker-sonic-vs:$(Build.DefinitionName).$(Build.BuildNumber)
       rm -rf $(Build.ArtifactStagingDirectory)/download
     displayName: "Run vs tests"
+    ${{ if ne(variables['Build.Reason'], 'PullRequest') }}:
+      continueOnError: true
 
   - task: PublishTestResults@2
     inputs: