Initial import of Gitlab CI for RockPi 4

.gitlab-ci.yml

+variables:
+  APT_OPTIONS: -y --allow-unauthenticated
+  ARCH: arm64
+  CROSS_COMPILE: aarch64-linux-gnu-
+stages:
+  - build
+  - pack
+
+# Retry jobs after runner system failures
+.retry: &retry
+  retry:
+    max: 2
+    when:
+      - runner_system_failure
+
+build:
+  stage: build
+  image: debian:testing
+  before_script:
+    - echo "deb  http://deb.debian.org/debian testing main contrib non-free" > /etc/apt/sources.list
+    - echo "deb-src http://deb.debian.org/debian testing main contrib non-free" >> /etc/apt/sources.list
+    - apt-get update && apt-get $APT_OPTIONS build-dep u-boot && apt-get $APT_OPTIONS install python-pyelftools gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
+  script:
+    - echo "CONFIG_NET_RANDOM_ETHADDR=y" >> configs/rock-pi-4-rk3399_defconfig
+    - make rock-pi-4-rk3399_defconfig
+    - make -j$(nproc)
+  artifacts:
+    name: u-boot
+    paths:
+      - $CI_PROJECT_DIR/u-boot-dtb.bin
+
+pack:
+  stage: pack
+  image: debian:testing
+  dependencies:
+    - build
+  artifacts:
+    name: bootloader
+    paths:
+      - $CI_PROJECT_DIR/rkbin/*.img
+  before_script:
+    - apt-get update && apt-get -y install git u-boot-tools
+    - git clone --depth 1 https://github.com/radxa/rkbin.git
+  script:
+    - cd rkbin
+    # Pack idbloader
+    - mkimage -n rk3399 -T rksd -d bin/rk33/rk3399_ddr_800MHz_*.bin idbloader.img
+    - cat bin/rk33/rk3399_miniloader_v*.bin >> idbloader.img
+    # Pack u-boot
+    - ./tools/loaderimage --pack --uboot ../u-boot-dtb.bin uboot.img 0x200000 --size 1024 1
+    # Pack ATF
+    - ./tools/trust_merger --size 1024 1 RKTRUST/RK3399TRUST.ini
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