Allow our own cabal-install bindist builds

.github/scripts/build.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+set -eux
+
+# shellcheck disable=SC1091
+. .github/scripts/env.sh
+# shellcheck disable=SC1091
+. .github/scripts/common.sh
+
+uname -a
+uname -p
+uname
+pwd
+env
+
+# ensure ghcup
+install_ghcup
+
+# build
+ghcup install ghc "${GHC_VERSION}"
+ghcup set ghc "${GHC_VERSION}"
+sed -i.bak -e '/DELETE MARKER FOR CI/,/END DELETE/d' cabal.project # see comment in cabal.project
+ecabal update
+ecabal user-config diff
+ecabal user-config init -f
+"ghc-${GHC_VERSION}" --info
+"ghc" --info
+
+# https://github.com/haskell/cabal/issues/7313#issuecomment-811851884
+if [ "$(getconf LONG_BIT)" == "32" ] || [ "${DISTRO}" == "CentOS" ] ; then
+    echo 'constraints: lukko -ofd-locking' >> cabal.project.release.local
+fi
+
+# shellcheck disable=SC2206
+args=(
+    -w "ghc-$GHC_VERSION"
+    --disable-profiling
+    --enable-executable-stripping
+    --project-file=cabal.project.release
+    ${ADD_CABAL_ARGS}
+)
+
+run cabal v2-build "${args[@]}" cabal-install
+
+mkdir -p "$CI_PROJECT_DIR/out"
+# shellcheck disable=SC2154
+cp "$(cabal list-bin "${args[@]}" cabal-install:exe:cabal)" "$CI_PROJECT_DIR/out/cabal$ext"
+cp dist-newstyle/cache/plan.json "$CI_PROJECT_DIR/out/plan.json"
+cd "$CI_PROJECT_DIR/out/"
+
+# create tarball/zip
+TARBALL_PREFIX="cabal-install-$("$CI_PROJECT_DIR/out/cabal" --numeric-version)"
+case "${TARBALL_EXT}" in
+    zip)
+        zip "${TARBALL_PREFIX}-${ARTIFACT}.${TARBALL_EXT}" "cabal${ext}" plan.json
+        ;;
+    tar.xz)
+        tar caf "${TARBALL_PREFIX}-${ARTIFACT}.${TARBALL_EXT}" "cabal${ext}" plan.json
+        ;;
+    *)
+        fail "Unknown TARBALL_EXT: ${TARBALL_EXT}"
+        ;;
+esac
+
+rm cabal plan.json
+