Add dockerfile for ubuntu 20.04 and alpine 3.14

docker/Dockerfile-alpine-3.14

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+FROM mcr.microsoft.com/powershell:alpine-3.14
+
+ARG REPOSITORY=PSGallery
+ARG MODULE=Az
+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:${VERSION}-alpine-3.14
+
+ENV AZUREPS_HOST_ENVIRONMENT="dockerImage/${VERSION}-alpine-3.14"
+
+LABEL maintainer="Azure PowerShell Team <azdevxps@microsoft.com>" \
+    readme.md="http://aka.ms/azpsdockerreadme" \
+    description="This Dockerfile will install the latest release of Azure PowerShell." \
+    org.label-schema.build-date=${BUILD_DATE} \
+    org.label-schema.usage="http://aka.ms/azpsdocker" \
+    org.label-schema.url="http://aka.ms/azpsdockerreadme" \
+    org.label-schema.vcs-url="https://github.com/Azure/azure-powershell" \
+    org.label-schema.name="azure powershell" \
+    org.label-schema.vendor="Azure PowerShell" \
+    org.label-schema.version=${VERSION} \
+    org.label-schema.schema-version="1.0" \
+    org.label-schema.vcs-ref=${VCS_REF} \
+    org.label-schema.docker.cmd="docker run --rm ${IMAGE_NAME} pwsh -c '\$PSVERSIONTABLE'" \
+    org.label-schema.docker.cmd.devel="docker run -it --rm -e 'DebugPreference=Continue' ${IMAGE_NAME} pwsh" \
+    org.label-schema.docker.cmd.test="currently not available" \
+    org.label-schema.docker.cmd.help="docker run --rm ${IMAGE_NAME} pwsh -c Get-Help"
+
+# install azure-powershell from PSGallery
+RUN pwsh -Command Set-PSRepository -Name ${REPOSITORY} -InstallationPolicy Trusted && \
+    pwsh -Command Install-Module -Name ${MODULE} -RequiredVersion ${VERSION} -Scope AllUsers -Repository ${REPOSITORY} && \
+    pwsh -Command Set-PSRepository -Name ${REPOSITORY} -InstallationPolicy Untrusted
+
+# create AzureRmContextSettings.json before it was generated
+COPY ${CONFIG}/${AZURERM_CONTEXT_SETTINGS} ${AZURE}/${AZURERM_CONTEXT_SETTINGS}
+
+CMD [ "pwsh" ]

docker/Dockerfile-ubuntu-20.04

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+FROM mcr.microsoft.com/powershell:ubuntu-20.04
+
+ARG REPOSITORY=PSGallery
+ARG MODULE=Az
+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:${VERSION}-ubuntu-20.04
+
+ENV AZUREPS_HOST_ENVIRONMENT="dockerImage/${VERSION}-ubuntu-20.04"
+
+LABEL maintainer="Azure PowerShell Team <azdevxps@microsoft.com>" \
+      readme.md="http://aka.ms/azpsdockerreadme" \
+      description="This Dockerfile will install the latest release of Azure PowerShell." \
+      org.label-schema.build-date=${BUILD_DATE} \
+      org.label-schema.usage="http://aka.ms/azpsdocker" \
+      org.label-schema.url="http://aka.ms/azpsdockerreadme" \
+      org.label-schema.vcs-url="https://github.com/Azure/azure-powershell" \
+      org.label-schema.name="azure powershell" \
+      org.label-schema.vendor="Azure PowerShell" \
+      org.label-schema.version=${VERSION} \
+      org.label-schema.schema-version="1.0" \
+      org.label-schema.vcs-ref=${VCS_REF} \
+      org.label-schema.docker.cmd="docker run --rm ${IMAGE_NAME} pwsh -c '\$PSVERSIONTABLE'" \
+      org.label-schema.docker.cmd.devel="docker run -it --rm -e 'DebugPreference=Continue' ${IMAGE_NAME} pwsh" \
+      org.label-schema.docker.cmd.test="currently not available" \
+      org.label-schema.docker.cmd.help="docker run --rm ${IMAGE_NAME} pwsh -c Get-Help"
+
+# install azure-powershell from PSGallery
+RUN pwsh -Command Set-PSRepository -Name ${REPOSITORY} -InstallationPolicy Trusted && \
+    pwsh -Command Install-Module -Name ${MODULE} -RequiredVersion ${VERSION} -Scope AllUsers -Repository ${REPOSITORY} && \
+    pwsh -Command Set-PSRepository -Name ${REPOSITORY} -InstallationPolicy Untrusted
+
+# create AzureRmContextSettings.json before it was generated
+COPY ${CONFIG}/${AZURERM_CONTEXT_SETTINGS} ${AZURE}/${AZURERM_CONTEXT_SETTINGS}
+
+CMD [ "pwsh" ]