add initial GitLab CI support

Uses currently proof-of-concept openwrt-ci[1] in order to:

 * improve the quality of the codebase in various areas
 * decrease code review time and help merging contributions faster
 * get automagic feedback loop on various platforms and tools
   - out of tree build with OpenWrt SDK on following targets:
     * ath79-generic
     * imx6-generic
     * malta-be
     * mvebu-cortexa53
   - out of tree native build on x86/64 with GCC (versions 7, 8, 9) and Clang 10
   - out of tree native x86/64 static code analysis with cppcheck and
     scan-build from Clang 10

1. https://gitlab.com/ynezz/openwrt-ci/

Signed-off-by: Petr Štetiar <ynezz@true.cz>

.gitlab-ci.yml

@@ -0,0 +1,6 @@
+variables:
+  CI_TARGET_BUILD_DEPENDS: ucert
+
+include:
+  - remote: https://gitlab.com/ynezz/openwrt-ci/raw/master/openwrt-ci/gitlab/main.yml
+  - remote: https://gitlab.com/ynezz/openwrt-ci/raw/master/openwrt-ci/gitlab/pipeline.yml