Allow our own cabal-install bindist builds

.github/scripts/env.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+mkdir -p "$HOME"/.local/bin
+
+if [ "${RUNNER_OS}" = "Windows" ] ; then
+	ext=".exe"
+else
+	# shellcheck disable=SC2034
+	ext=''
+fi
+
+export PATH="$HOME/.local/bin:$PATH"
+
+export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
+export BOOTSTRAP_HASKELL_CABAL_VERSION="${CABAL_VER:-3.8.1.0}"
+export BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG=no
+export BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes
+export BOOTSTRAP_HASKELL_ADJUST_BASHRC=1
+
+if [ "${RUNNER_OS}" = "Windows" ] ; then
+    # on windows use pwd to get unix style path
+    CI_PROJECT_DIR="$(pwd)"
+    export CI_PROJECT_DIR
+    export GHCUP_INSTALL_BASE_PREFIX="/c"
+    export GHCUP_BIN="$GHCUP_INSTALL_BASE_PREFIX/ghcup/bin"
+    export PATH="$GHCUP_BIN:$PATH"
+    export CABAL_DIR="C:\\Users\\runneradmin\\AppData\\Roaming\\cabal"
+else
+    export CI_PROJECT_DIR="${GITHUB_WORKSPACE}"
+    export GHCUP_INSTALL_BASE_PREFIX="$CI_PROJECT_DIR"
+    export GHCUP_BIN="$GHCUP_INSTALL_BASE_PREFIX/.ghcup/bin"
+    export PATH="$GHCUP_BIN:$PATH"
+    export CABAL_DIR="$CI_PROJECT_DIR/cabal"
+    export CABAL_CACHE="$CI_PROJECT_DIR/cabal-cache"
+fi
+
+export DEBIAN_FRONTEND=noninteractive
+export TZ=Asia/Singapore