Add debian build check

packaging/debian/rules

 override_dh_auto_install:
 
 	make install PREFIX=/usr DESTDIR=debian/tmp
+
+override_dh_auto_test:
+	make install PREFIX=/usr DESTDIR=debian/tmp
+	make test \
+		SHELLFU_PATH=$(shell pwd)/debian/tmp/usr/share/shellfu/include-bash \
+		_PXPATH__BIN=$(shell pwd)/debian/tmp/usr/libexec/shellfu-bash-pxpath/pxpath