add gitlab ci

mise.toml

@@ -51,4 +51,46 @@ run = '''
 set -euo pipefail
 cd backend && staticcheck ./...
 cd ../mobile-kotlin && ./gradlew :app:lint -q
+'''
+
+[tasks.build:release]
+description = "Build signed release APK (assembleRelease)"
+dir = "mobile-kotlin"
+run = '''
+#!/usr/bin/env bash
+set -euo pipefail
+if [ ! -f app/signing.properties ] && [ -z "${SIGNING_STORE_FILE:-}" ]; then
+  echo "signing.properties absent — copiez app/signing.properties.example et"
+  echo "préparez un keystore, ou fournissez SIGNING_STORE_FILE (CI)." >&2
+  exit 1
+fi
+./gradlew :app:assembleRelease -q
+echo "APK : app/build/outputs/apk/release/app-release.apk"
+'''
+
+[tasks.docker:build]
+description = "Build the backend Docker image (tagged with VERSION)"
+run = '''
+set -euo pipefail
+VERSION=$(cat VERSION)
+docker build \\
+  --build-arg VERSION="$VERSION" \\
+  --build-arg BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)" \\
+  -t vaultdrop-server:"$VERSION" \\
+  ./backend
+echo "Image : vaultdrop-server:$VERSION"
+'''
+
+[tasks.release]
+description = "Local release checklist: test, build artifacts, tag, push"
+run = '''
+set -euo pipefail
+VERSION=$(cat VERSION)
+echo ">>> Version : $VERSION (tag cible v$VERSION)"
+mise run test
+mise run build
+mise run docker:build
+echo
+echo "Prêt à tagger ? La CI GitLab construira la release finale à partir du tag."
+echo "  git tag v$VERSION && git push origin v$VERSION"
 '''