workflows: add plugin lint action

Author: LeoKle

.github/actions/plugin/lint/action.yml

@@ -0,0 +1,22 @@
+name: clang-format check
+description: Checks formatting using clang-format
+
+inputs:
+  source-dir:
+    description: 'Root directory of the cpp project'
+    required: false
+    default: '.'
+
+runs:
+  using: composite
+  steps:
+    - name: Install clang-format
+      shell: bash
+      run: sudo apt-get install -y clang-format
+
+    - name: Run clang-format
+      shell: bash
+      run: |
+        find ${{ inputs.source-dir }}/src ${{ inputs.source-dir }}/tests \
+          -name '*.cpp' -o -name '*.h' | \
+        xargs clang-format --dry-run --Werror