[enh] run npm, bower and gulp at build time. make sure it starts from a clean env

debian/rules

@@ -19,7 +19,17 @@ override_dh_auto_install:
 	# to serve old css/js files
 	sed -i 's/VERSION/$(DEBVERS)/g' src/index.html
 
-	# Install source files and set permissions
-	mkdir -p $(TMPDIR)/usr/share/yunohost
-	cp -r src $(TMPDIR)/usr/share/yunohost/admin
-	chown -R www-data $(TMPDIR)/usr/share/yunohost/admin
+	# Run npm/bower/gulp
+	# For some unknown reason, the postinstall scripts in package.json cannot be run, and triggers this error :
+	# "npm WARN cannot run in wd yunohost-admin@ bower install && gulp build (wd=/build/path)"
+	cd src ; \
+	env npm_config_progress=false npm install ; \
+	node_modules/bower/bin/bower install --allow-root ; \
+	node_modules/gulp/bin/gulp.js build
+
+override_dh_clean:
+	dh_clean
+	rm -rf src/node_modules
+	rm -rf src/bower_components
+	rm -rf src/dist
+