Use helper function for logging ghcup logs and exiting on failure

.github/scripts/bindist.sh

@@ -21,8 +21,8 @@ case "${TARBALL_EXT}" in
 		# from the oldest version in the list
 		: "${GHCS:="$(cd "$CI_PROJECT_DIR/out/${ARTIFACT}" && rm -f ./*.json && for ghc in * ; do printf "%s\n" "$ghc" ; done | sort -r | tr '\n' ' ')"}"
 		emake --version
-		emake GHCUP=ghcup ARTIFACT="${ARTIFACT}" GHCS="${GHCS}" bindist || ( cat /github/workspace/.ghcup/logs/* ; fail "make bindist failed" )
-		emake GHCUP=ghcup ARTIFACT="${ARTIFACT}"                bindist-tar || ( cat /github/workspace/.ghcup/logs/* ; fail "make bindist failed" )
+		emake GHCUP=ghcup ARTIFACT="${ARTIFACT}" GHCS="${GHCS}" bindist     || fail_with_ghcup_logs "make bindist failed"
+		emake GHCUP=ghcup ARTIFACT="${ARTIFACT}"                bindist-tar || fail_with_ghcup_logs "make bindist failed"
         ;;
     *)
         fail "Unknown TARBALL_EXT: ${TARBALL_EXT}"

.github/scripts/build.sh

@@ -11,15 +11,17 @@ uname
 pwd
 env
 
-# ensure ghcup
+# Ensure ghcup is present and properly configured.
+# Sets up the vanilla channel, as HLS CI provides binaries
+# for GHCup's vanilla channel.
 install_ghcup
 
 # ensure cabal-cache
 download_cabal_cache "$HOME/.local/bin/cabal-cache"
 
 
 # build
-ghcup install ghc "${GHC_VERSION}" || cat /github/workspace/.ghcup/logs/*
+ghcup install ghc "${GHC_VERSION}" || fail_with_ghcup_logs "install ghc"
 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

.github/scripts/common.sh

@@ -182,6 +182,10 @@ error() { echo_color "${RED}" "$1"; }
 warn() { echo_color "${LT_BROWN}" "$1"; }
 info() { echo_color "${LT_BLUE}" "$1"; }
 
+fail_with_ghcup_logs() {
+  cat /github/workspace/.ghcup/logs/*
+  fail "$!"
+}
 fail() { error "error: $1"; exit 1; }
 
 run() {