Add workflow to build ghc-alpine

.github/workflows/release-ghc-alpine.yaml

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+on:
+  push:
+    branches:
+      - ekw/SRE-996/release-ghc-alpine
+    tags:
+      - ghc-alpine/*
+
+jobs:
+  release-ghc-alpine:
+    uses: concordium/.github/.github/workflows/s3-release-workflow.yaml@ekw/SRE-996/s3-artifact
+    with:
+      SERVICE_NAME: "ghc-alpine"
+      BUILD_ARGS: --build-arg BOOTSTRAP_HASKELL_GHC_VERSION="9.4.6" --build-arg GHC_VERSION="9.4.6"
+      DOCKER_FILE: docker/ghc-alpine.Dockerfile
+      FILE_NAME: "ghc-9.2.5-x86_64-unknown-linux-integer-gmp.tar.xz"
+      BUCKET: "s3://static-libraries.concordium.com"
+      IAM_ROLE: "arn:aws:iam::192549843005:role/github_ghc-alpine"

docker/ghc-alpine.Dockerfile

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+FROM alpine:latest
+ARG GHC_VERSION
+ARG BOOTSTRAP_HASKELL_GHC_VERSION
+
+WORKDIR /
+
+# Install system ghc and dependencies
+RUN apk add musl-dev python3 autoconf automake ncurses-dev make file g++ xz git bash wget gmp-dev gmp libffi libffi-dev curl
+ENV BOOTSTRAP_HASKELL_NONINTERACTIVE=1
+ENV BOOTSTRAP_HASKELL_NO_UPGRADE=1
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
+
+# Get GHC source
+RUN git clone -b ghc-"$GHC_VERSION"-release https://gitlab.haskell.org/ghc/ghc.git/ --recurse-submodules
+
+COPY ../scripts/ghc-alpine-build.sh /ghc-alpine-build.sh
+RUN chmod +x /ghc-alpine-build.sh
+ENTRYPOINT ["../scripts/ghc-alpine-build.sh"]

scripts/ghc-alpine-build.sh

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+#!/bin/sh
+
+set -ex
+
+. "$HOME/.ghcup/env"
+
+cd ghc/
+cabal install happy alex --install-method=copy
+cp ~/.cabal/bin/* /usr/bin
+
+# Build GHC
+./boot
+./configure --disable-numa
+./hadrian/build -j17 --docs=none
+mkdir _build/docs
+./hadrian/build binary-dist --docs=none
+
+# Copy ghc to out
+ls _build
+ls _build/bindist
+cp _build/bindist/ghc-"$GHC_VERSION"-x86_64-unknown-linux.tar.xz /build/dpkg-build-package/ghc-"$GHC_VERSION"-x86_64-unknown-linux-integer-gmp.tar.xz