build: extract marketing and simplify releases (#1594)

scripts/setup-private-marketing.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+set -euo pipefail
+
+repo_root="$(git rev-parse --show-toplevel)"
+cd "$repo_root"
+
+initialize_command="git -c submodule.fluxer_marketing.update=checkout submodule update --init -- fluxer_marketing"
+
+if ! git -c submodule.fluxer_marketing.update=checkout submodule update --init -- fluxer_marketing; then
+	printf '%s\n' \
+		"Unable to initialize the private fluxerapp/marketing repository." \
+		"Confirm that your GitHub account has access and that your existing Git credentials can authenticate, then run:" \
+		"  $initialize_command" >&2
+	exit 1
+fi
+
+if [[ ! -f fluxer_marketing/Cargo.toml ]]; then
+	printf '%s\n' \
+		"The marketing submodule initialized without its required Cargo.toml." \
+		"Remove the inconsistent checkout and run:" \
+		"  $initialize_command" >&2
+	exit 1
+fi
+
+printf '%s\n' \
+	"Private marketing source is initialized at fluxer_marketing." \
+	"Install its dependencies explicitly with:" \
+	"  pnpm --dir fluxer_marketing install --frozen-lockfile"