Build a PowerShell Docker image based on Alpine Linux.

Dockerfile

# syntax=docker/dockerfile:1

# Based on the installation instructions on the following page.
# https://learn.microsoft.com/powershell/scripting/install/install-alpine

FROM alpine/curl AS download
ARG package=https://github.com/PowerShell/PowerShell/releases/download/v7.4.3/powershell-7.4.3-linux-musl-x64.tar.gz
RUN curl -L $package -o /tmp/powershell.tar.gz
WORKDIR /tmp/release
RUN tar zxf /tmp/powershell.tar.gz
RUN chmod +x pwsh

FROM alpine:3.17
RUN apk add --no-cache ca-certificates less ncurses-terminfo-base \
    krb5-libs libgcc libintl libssl1.1 libstdc++ tzdata userspace-rcu zlib icu-libs
RUN apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache lttng-ust
COPY --from=download /tmp/release /opt/microsoft/powershell/7
RUN ln -s /opt/microsoft/powershell/7/pwsh /usr/bin/pwsh
ENTRYPOINT ["pwsh"]

See also: https://github.com/PowerShell/PowerShell-Docker/blob/master/release/7-5/alpine317/docker/Dockerfile