Add clang format and corresponding ci action

.clang-format

@@ -0,0 +1,28 @@
+BasedOnStyle: LLVM
+Language: Cpp
+
+IndentWidth: 4
+UseTab: Never
+#NamespaceIndentation: All
+
+PointerAlignment: Left
+AccessModifierOffset: -4
+AlwaysBreakTemplateDeclarations: true
+LambdaBodyIndentation: Signature
+
+MaxEmptyLinesToKeep: 3
+#ColumnLimit: 128
+
+CompactNamespaces: true
+FixNamespaceComments: true
+
+AllowShortFunctionsOnASingleLine: false
+AllowShortIfStatementsOnASingleLine: true
+
+AlignConsecutiveAssignments: true
+AlignConsecutiveBitFields: true
+AlignConsecutiveDeclarations: true
+AlignConsecutiveMacros: true
+
+#BraceWrapping:
+#  BeforeElse: true

.gitea/workflows/clang-format.yaml

@@ -0,0 +1,19 @@
+name: clang-format Check
+on: [push, pull_request]
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        path:
+          - 'components'
+          - 'main'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run clang-format style check for C/C++/Protobuf programs.
+        uses: jidicula/clang-format-action@v4.4.1
+        with:
+          clang-format-version: '13'
+          check-path: ${{ matrix.path }}
+          fallback-style: 'Mozilla' # optional