Add CI job to check Play Store character count limit requirements

.github/workflows/check-playstore-requirements.yml

@@ -0,0 +1,20 @@
+name: 🔢 Check Play Store requirements
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'fastlane/metadata'
+
+jobs:
+  check:
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: ✅ Check character limits
+        run: ./_ci/check_playstore_requirements.sh

_ci/check_playstore_requirements.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+origin=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd) || exit
+
+# shellcheck disable=SC1091
+. "${origin}/utils.sh"
+
+langs=("en-US" "fr-FR")
+
+# Play Store requirements: https://support.google.com/googleplay/android-developer/answer/113469?hl=en#details
+app_name_char_count_limit=30
+short_description_char_count_limit=80
+full_description_char_count_limit=4000
+changelog_char_count_limit=500
+
+error_count=0
+
+step "Google Play Store check"
+
+for lang in "${langs[@]}"; do
+  lang_dir="${origin}/../fastlane/metadata/store/${lang}"
+
+  info "Processing store metadata for ${BLUE}${lang}${RESET}"
+  for filepath in "title.txt" "short_description.txt" "full_description.txt" "changelogs/default.txt"; do
+    file="${lang_dir}/${filepath}"
+    filename="$(basename "${file}" .txt)"
+    case "${filename}" in
+      title) limit=${app_name_char_count_limit};;
+      short_description) limit=${short_description_char_count_limit};;
+      full_description) limit=${full_description_char_count_limit};;
+      default) limit=${changelog_char_count_limit};;
+    esac
+
+    grep -q '[[:blank:]]$' "${file}" && warn "${YELLOW}${filepath}${RESET} has trailing spaces"
+
+    char_count=$(wc -m < "${file}" | awk '{print $1}')
+    if [ "${char_count}" -gt "${limit}" ]; then
+      error "${YELLOW}${filepath}${RESET} is too long (${RED_BOLD}${char_count}${RESET} vs ${GREEN}${limit}${RESET})"
+      ((error_count+=1))
+    fi
+  done
+done
+
+if [ ${error_count} -eq 0 ]; then
+  step_done
+  exit 0
+else
+  error "You have ${error_count} errors to fix"
+  exit ${error_count}
+fi