add timestamp to docker image

Author: VeryEarly

docker/Dockerfile-centos-7

@@ -8,12 +8,14 @@ ARG CONFIG=config
 ARG AZURERM_CONTEXT_SETTINGS=AzureRmContextSettings.json
 ARG AZURE=/root/.Azure
 ARG VCS_REF="none"
+ARG Build_Date=
 ARG VERSION=
 ARG IMAGE_NAME=mcr.microsoft.com/azure-powershell:${VERSION}-centos-7
 
 LABEL maintainer="Azure PowerShell Team <[email protected]>" \
       readme.md="http://aka.ms/azpsdockerreadme" \
       description="This Dockerfile will install the latest release of Azure PowerShell." \
+      org.label-schema.build-date=${Build_Date} \
       org.label-schema.usage="http://aka.ms/azpsdocker" \
       org.label-schema.url="http://aka.ms/azpsdockerreadme" \
       org.label-schema.vcs-url="https://github.com/Azure/azure-powershell" \

docker/Dockerfile-debian-9

@@ -8,12 +8,14 @@ ARG CONFIG=config
 ARG AZURERM_CONTEXT_SETTINGS=AzureRmContextSettings.json
 ARG AZURE=/root/.Azure
 ARG VCS_REF="none"
+ARG Build_Date=
 ARG VERSION=
 ARG IMAGE_NAME=mcr.microsoft.com/azure-powershell:${VERSION}-debian-9
 
 LABEL maintainer="Azure PowerShell Team <[email protected]>" \
       readme.md="http://aka.ms/azpsdockerreadme" \
       description="This Dockerfile will install the latest release of Azure PowerShell." \
+      org.label-schema.build-date=${Build_Date} \
       org.label-schema.usage="http://aka.ms/azpsdocker" \
       org.label-schema.url="http://aka.ms/azpsdockerreadme" \
       org.label-schema.vcs-url="https://github.com/Azure/azure-powershell" \

docker/Dockerfile-ubuntu-18.04

@@ -8,12 +8,14 @@ ARG CONFIG=config
 ARG AZURERM_CONTEXT_SETTINGS=AzureRmContextSettings.json
 ARG AZURE=/root/.Azure
 ARG VCS_REF="none"
+ARG Build_Date=
 ARG VERSION=
 ARG IMAGE_NAME=mcr.microsoft.com/azure-powershell:${VERSION}-ubuntu-18.04
 
 LABEL maintainer="Azure PowerShell Team <[email protected]>" \
       readme.md="http://aka.ms/azpsdockerreadme" \
       description="This Dockerfile will install the latest release of Azure PowerShell." \
+      org.label-schema.build-date=${Build_Date} \
       org.label-schema.usage="http://aka.ms/azpsdocker" \
       org.label-schema.url="http://aka.ms/azpsdockerreadme" \
       org.label-schema.vcs-url="https://github.com/Azure/azure-powershell" \

tools/docker/BuildImages.ps1

@@ -25,9 +25,10 @@ try {
     foreach ($dockerfile in (Get-ChildItem -Path $DOCKER -Filter "Dockerfile-*").FullName) {
         $os = $dockerfile.split("Dockerfile-")[1]
         Write-Output $os
-        docker build --build-arg VERSION=$version -t $DockerImageName':'$version"-"$os -f $dockerfile $DOCKER
+        docker build --build-arg VERSION=$version --build-arg BUILD_DATE="date -u +'%Y-%m-%dT%H:%M:%SZ'" \
+                     -t $DockerImageName':'$version"-"$os -f $dockerfile $DOCKER
     }
 } catch {
     $Errors = $_
-    Write-Error ($_ | Out-String)
+    Write-Error ($Errors | Out-String)
 }