chore: update workflows

Author: luator

.github/workflows/cpp_format.yml

@@ -0,0 +1,14 @@
+name: Linters
+
+on: pull_request
+
+jobs:
+  format:
+    name: C++ Formatting
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: wget https://raw.githubusercontent.com/machines-in-motion/mpi_cmake_modules/master/scripts/run-clang-format
+      - run: wget https://raw.githubusercontent.com/machines-in-motion/mpi_cmake_modules/master/resources/_clang-format
+      - run: python ./run-clang-format -r .

.github/workflows/git_fixup.yml

@@ -0,0 +1,12 @@
+name: Git Checks
+
+on: [pull_request]
+
+jobs:
+  block-fixup:
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v2.0.0
+    - name: Block Fixup Commit Merge
+      uses: 13rac1/block-fixup-merge-action@v2.0.0

.github/workflows/python_black.yml

@@ -0,0 +1,11 @@
+name: Linters
+
+on: [pull_request]
+
+jobs:
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - uses: psf/black@stable

.github/workflows/todo_check.yml

@@ -0,0 +1,28 @@
+name: TODO checks
+
+on: pull_request
+
+jobs:
+  fixmes:
+    name: New FIXMEs
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: git fetch origin ${GITHUB_BASE_REF}
+    - name: Check for FIXMEs
+      uses: luator/github_action_check_new_todos@v1
+      with:
+          label: FIXME
+          base_ref: origin/${{ github.base_ref }}
+
+  todos:
+    name: New TODOs
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: git fetch origin ${GITHUB_BASE_REF}
+    - name: Check for TODOs
+      uses: luator/github_action_check_new_todos@v1
+      with:
+          label: TODO
+          base_ref: origin/${{ github.base_ref }}