[LOCAL] Add a GitLab-CI config

.github/workflows/build.yaml

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+name: build
+on: [push]
+jobs:
+  dt-binding-check:
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get update
+      - run: sudo apt-get install -y libyaml-dev
+      - run: pip3 --user install git+https://github.com/devicetree-org/dt-schema.git@main
+      - run: pwd; echo ~; ls -lh ~/.local/bin  # DEBUG
+      - uses: actions/checkout@v2
+      - run: make ARCH=arm W=1 wpcm450_defconfig
+      - run: make ARCH=arm W=1 dt_binding_check -j$(nproc || echo 1)
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get update
+      - run: sudo apt-get install -y gcc-arm-linux-gnueabi
+      - uses: actions/checkout@v2
+      - run: make ARCH=arm W=1 CROSS_COMPILE=arm-linux-gnueabi- wpcm450_defconfig
+      - run: make ARCH=arm W=1 CROSS_COMPILE=arm-linux-gnueabi- -j$(nproc || echo 1)

.gitlab-ci.yml

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+image: debian:11
+
+.common:
+  before_script:
+    - apt-get update
+    - apt-get install -y git pkg-config python3-pip yamllint libyaml-dev build-essential gcc-arm-linux-gnueabi flex bison bc lzop libssl-dev swig
+    - pip3 install git+https://github.com/devicetree-org/dt-schema.git@main
+    - pwd; echo ~; ls -lh ~/.local/bin  # DEBUG
+  script:
+    - make ARCH=arm W=1 CROSS_COMPILE=arm-linux-gnueabi- wpcm450_defconfig
+    - make ARCH=arm W=1 CROSS_COMPILE=arm-linux-gnueabi- ${TARGET} -j$(nproc || echo 1)
+
+build:
+  extends: .common
+
+binding-check:
+  extends: .common
+  variables:
+    TARGET: dt_binding_check