Add black-check to workflow (#3)

* Test workflow

* Try add balck action

* Enable for pull request

* Change triger back

.github/workflows/psm-interop.yaml

@@ -1,5 +1,9 @@
 name: PSM Interop
 
+env:
+  # Force the stdout and stderr streams to be unbuffered
+  PYTHONUNBUFFERED: 1
+
 on:
   pull_request:
   push:
@@ -72,3 +76,12 @@ jobs:
       - name: "Run unit tests"
         if: ${{ steps.paths_filter.outputs.psm_interop_src == 'true' }}
         run: python -m tests.unit
+
+  black-check:
+     runs-on: ubuntu-latest
+     steps:
+        - uses: actions/checkout@v4
+        - uses: psf/black@stable
+          with:
+             options: "--check --config black.toml"
+             version: "23.3.0"

black.toml

@@ -0,0 +1,16 @@
+[tool.black]
+line-length = 80
+target-version = [
+  "py37",
+  "py38",
+  "py39",
+  "py310",
+  "py311",
+]
+
+[tool.isort]
+profile = "black"
+line_length = 80
+single_line_exclusions = ["typing"]
+force_single_line = true
+force_sort_within_sections = true