GitHub Actions infrastructure for formatting checks (#1055)

* add pre-commit config

* GitHub Actions starting with pre-commit

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+---
+name: ci
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+  pull_request:
+
+concurrency:
+  group: ci-${{github.ref}}-${{github.event.pull_request.number || github.run_number}}
+  cancel-in-progress: true
+
+jobs:
+  prechecks:
+    uses: ./.github/workflows/pre-commit.yml
+  all-prechecks:
+    needs: [prechecks]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Success
+        run: "true"

.github/workflows/pre-commit.yml

@@ -0,0 +1,18 @@
+---
+name: pre-commit
+
+# yamllint disable-line rule:truthy
+on:
+  workflow_call:
+
+concurrency:
+  group: style-${{github.ref}}-${{github.event.pull_request.number || github.run_number}}
+  cancel-in-progress: true
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+      - uses: pre-commit/[email protected]

.pre-commit-config.yaml

@@ -0,0 +1,37 @@
+---
+fail_fast: false
+repos:
+  - repo: meta
+    hooks:
+      - id: check-hooks-apply
+      - id: check-useless-excludes
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: "v4.5.0"
+    hooks:
+      - id: check-case-conflict
+      - id: check-merge-conflict
+  - repo: https://github.com/cheshirekow/cmake-format-precommit
+    rev: "v0.6.13"
+    hooks:
+      - id: cmake-format
+        args: [--config-files, experimental/.cmake-format.yaml]
+        additional_dependencies:
+          - pyyaml
+      - id: cmake-lint
+        additional_dependencies:
+          - pyyaml
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: "v12.0.1"
+    hooks:
+      - id: clang-format
+        types_or: [c++, c]
+        exclude: |
+          (?x)(
+              build/|
+              src/sst/core/libltdl/|
+              external/
+          )
+  - repo: https://github.com/Mateusz-Grzelinski/actionlint-py
+    rev: "v1.6.26.11"
+    hooks:
+      - id: actionlint