Create Dockerfile

.github/workflows/main.yml

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+name: A workflow for my Hello World file
+on: push

action-a/Dockerfile

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+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+# Docker image file that describes an Alpine3.12 image with PowerShell installed from .tar.gz file(s)
+
+FROM alpine:3.12 AS installer-env
+
+# Define Args for the needed to add the package
+ARG PS_VERSION=7.0.0
+ARG PS_PACKAGE=powershell-${PS_VERSION}-linux-alpine-x64.tar.gz
+ARG PS_PACKAGE_URL=https://github.com/PowerShell/PowerShell/releases/download/v${PS_VERSION}/${PS_PACKAGE}
+ARG PS_INSTALL_VERSION=7
+
+# Download the Linux tar.gz and save it
+ADD ${PS_PACKAGE_URL} /tmp/linux.tar.gz
+
+# define the folder we will be installing PowerShell to
+ENV PS_INSTALL_FOLDER=/opt/microsoft/powershell/$PS_INSTALL_VERSION
+
+# Create the install folder
+RUN mkdir -p ${PS_INSTALL_FOLDER}
+
+# Unzip the Linux tar.gz
+RUN tar zxf /tmp/linux.tar.gz -C ${PS_INSTALL_FOLDER} -v
+
+# Start a new stage so we lose all the tar.gz layers from the final image
+FROM alpine:3.12.1
+
+# Copy only the files we need from the previous stage
+COPY --from=installer-env ["/opt/microsoft/powershell", "/opt/microsoft/powershell"]
+
+# Define Args and Env needed to create links
+ARG PS_INSTALL_VERSION=7
+ENV PS_INSTALL_FOLDER=/opt/microsoft/powershell/$PS_INSTALL_VERSION \
+    \
+    # Define ENVs for Localization/Globalization
+    DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=false \
+    LC_ALL=en_US.UTF-8 \
+    LANG=en_US.UTF-8 \
+    # set a fixed location for the Module analysis cache
+    PSModuleAnalysisCachePath=/var/cache/microsoft/powershell/PSModuleAnalysisCache/ModuleAnalysisCache \
+    POWERSHELL_DISTRIBUTION_CHANNEL=PSDocker-Alpine-3.12
+
+# Install dotnet dependencies and ca-certificates
+RUN apk add --no-cache \
+    ca-certificates \
+    less \
+    \
+    # PSReadline/console dependencies
+    ncurses-terminfo-base \
+    \
+    # .NET Core dependencies
+    krb5-libs \
+    libgcc \
+    libintl \
+    libssl1.1 \
+    libstdc++ \
+    tzdata \
+    userspace-rcu \
+    zlib \
+    icu-libs \
+    && apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache \
+    lttng-ust \
+    \
+    # PowerShell remoting over SSH dependencies
+    openssh-client \
+    \
+    # Create the pwsh symbolic link that points to powershell
+    && ln -s ${PS_INSTALL_FOLDER}/pwsh /usr/bin/pwsh \
+    \
+    # Give all user execute permissions and remove write permissions for others
+    && chmod a+x,o-w ${PS_INSTALL_FOLDER}/pwsh \
+    # intialize powershell module cache
+    # and disable telemetry
+    && export POWERSHELL_TELEMETRY_OPTOUT=1 \
+    && pwsh \
+        -NoLogo \
+        -NoProfile \
+        -Command " \
+          \$ErrorActionPreference = 'Stop' ; \
+          \$ProgressPreference = 'SilentlyContinue' ; \
+          while(!(Test-Path -Path \$env:PSModuleAnalysisCachePath)) {  \
+            Write-Host "'Waiting for $env:PSModuleAnalysisCachePath'" ; \
+            Start-Sleep -Seconds 6 ; \
+          }"
+
+CMD [ "pwsh" ]
+ENTRYPOINT ["/entrypoint.sh"]

action-a/action.yml

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+name: "Hello Actions"
+description: "Greet someone"
+author: "octocat@github.com"
+
+inputs:
+  MY_NAME:
+    description: "Who to greet"
+    required: true
+    default: "Max"
+
+runs:
+  using: "docker"
+  image: "Dockerfile"
+
+branding:
+  icon: "mic"
+  color: "purple"

action-a/entrypoint.sh

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+pwsh -f hello.ps1

action-a/hello.ps1

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+{"Hello, {0}!" -f $env:MY_NAME}