[CICD] Add CI with build job

Add first .gitlab-ci.yml file with build job. Changed
image and toolchain path to compile for kernel 5.10

.gitignore

@@ -96,6 +96,7 @@ modules.order
 !.gitattributes
 !.gitignore
 !.mailmap
+!.gitlab-ci.yml
 
 #
 # Generated include files

.gitlab-ci.yml

+stages:
+ - build
+
+default:
+    image: secodocker/seco-builder:latest
+    artifacts:
+        paths:
+          - $PATH_MOD
+        expire_in: 48 hrs
+
+build:
+    stage: build
+    variables:
+      PATH_MOD: "build_${CI_JOB_NAME}"
+      SRC_DIR: "arch/arm64/boot/dts/seco/"
+      IMAGE_DIR: "arch/arm64/boot/Image"
+      DEFCONFIG_FILE: "seco_imx8_linux_defconfig"
+      TOOLCHAIN_PATH: /opt/fsl-imx-wayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux
+      FILE_CP_EXT: dtb dtbo
+      FILE_CP_CPU: imx8mq imx8qm imx8qx imx8mm imx8mn imx8mp
+    script:
+      #source the toolchain for iMX8
+      - source ${TOOLCHAIN_PATH}
+      - export ARCH=arm64
+      - unset LD_LIBRARY_PATH
+      #generate config file and compile
+      - make ${DEFCONFIG_FILE}
+      - mkdir ${PATH_MOD}/boot -p
+      - make -j$(nproc)
+      #copy image
+      - cp $IMAGE_DIR $PATH_MOD/boot/ -f
+      #generate the script that copies the files
+      - |
+        touch copy_files.sh
+        chmod a+x copy_files.sh
+        echo "#!/bin/bash" >> copy_files.sh
+        for cpu in ${FILE_CP_CPU[@]}; do
+            for ext in ${FILE_CP_EXT[@]}; do
+                echo "find ${SRC_DIR} -name \"*"${cpu}"*"${ext}"\" -exec cp {} ${PATH_MOD}/boot/ \;" >> copy_files.sh
+            done
+        done
+        ./copy_files.sh
+      #make modules
+      - make -j$(nproc) modules_install INSTALL_MOD_PATH=${PATH_MOD}
+    rules:
+      - if: $CI_PIPELINE_SOURCE == "push"
+        when: always