[prepare] add CI

.gitlab-ci.yml

+### Generic CI Template for chrootbuild
+#
+#
+#  Usage: chrootbuild [options]
+#
+#     -b <branch> Branch to use:
+#                 (unstable/testing/stable-staging/stable;
+#                 arm-unstable/arm-testing/arm-stable)
+#                 default: unstable / arm-unstable
+#     -c          Start with clean chroot fs
+#     -h          This help
+#     -i <pkg>    Install package(s) to chroot fs
+#                 (for multiple packages repeat -i flag)
+#     -l <list>   List(s) to build
+#                 (for multiple lists repeat -l flag)
+#     -n          Install built pkg to chroot fs
+#     -p <pkg>    Package(s) to build
+#                 (for multiple packages repeat -p flag)
+#     -r          Remove previously built packages in $PKGDEST
+#     -s          Sign package(s)
+
+package:
+  tags:
+    - aarch64
+  script:
+    # build pkg via chrootbuild
+    - export PKG=${PWD##*/}
+    - cd ..
+    - sudo chrootbuild -cp $PKG
+    - mv -v ./*.pkg.tar.* $PKG
+  artifacts:
+    paths:
+    - ./*.pkg.tar.*
+    expire_in: 1 week