add lint workflow

Related-To: NEO-6259
Closes: intel/compute-runtime#459
Signed-off-by: Artur Harasimiuk <artur.harasimiuk@intel.com>

.github/actions/neo-lint/Dockerfile

@@ -0,0 +1,14 @@
+#
+# Copyright (C) 2021 Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+
+FROM docker.io/ubuntu:20.04
+
+RUN apt-get -y update ; apt-get install -y --no-install-recommends gpg software-properties-common
+RUN apt-get -y update ; apt-get install -y --no-install-recommends clang-format-11 git
+
+COPY lint.sh /lint.sh
+
+ENTRYPOINT ["/lint.sh"]

.github/actions/neo-lint/action.yml

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+# action.yml
+#
+# Copyright (C) 2021 Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+
+name: 'Neo lint'
+description: 'check coding style'
+inputs:
+  path:
+    description: 'Relative path under $GITHUB_WORKSPACE to place the repository'
+  iregex:
+    description: 'iregex to pass to clang-format'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/neo-lint/lint.sh

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+#!/bin/bash
+#
+# Copyright (C) 2021 Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+
+set -e
+
+clang-format-11 --version
+
+INPUT_PATH="${INPUT_PATH:-.}"
+INPUT_IREGEX="${INPUT_IREGEX:-.*\.(cpp|h|inl)}"
+
+(
+    cd ${INPUT_PATH}
+    git fetch origin ${GITHUB_BASE_REF}
+    set -x
+    git diff -U0 --no-color origin/master..HEAD | clang-format-diff-11 -p1 -i -v -iregex ${INPUT_IREGEX}
+    set +x
+)
+
+if [ -n "$(git -C ${INPUT_PATH} status --porcelain)" ]; then
+    git -C ${INPUT_PATH} diff
+    exit 1
+fi

.github/workflows/verify.yml

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+#
+# Copyright (C) 2021 Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+
+name: verify
+on:
+  - pull_request
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        path: neo
+    - name: lint
+      uses: ./neo/.github/actions/neo-lint
+      with:
+        path: neo