switch to composite action

.github/workflows/build.yaml

@@ -1,29 +1,24 @@
-name: Reusable build workflow
-
-on:
-  workflow_call:
-    inputs:
-      os:
-        default: "ubuntu-20.04"
-        description: "Value for 'runs-on'"
-        required: false
-        type: string
-      python:
-        default: "3.9"
-        description: "Value for 'python-version'"
-        required: false
-        type: string
-
-jobs:
-  build:
-    runs-on: ${{ inputs.os }}
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ inputs.python }}
-      - name: Install dependencies
-        run: |
-          pip install poetry
-          poetry install --no-interaction
+name: "Reusable build workflow"
+inputs:
+  # os:
+  #   default: "ubuntu-20.04"
+  #   description: "Value for 'runs-on'"
+  #   required: false
+  #   type: string
+  python:
+    default: "3.9"
+    description: "Value for 'python-version'"
+    required: false
+    type: string
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ inputs.python }}
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry install --no-interaction

.github/workflows/test.yaml

@@ -45,8 +45,8 @@ jobs:
           poetry install --no-interaction
 
   formatting:
-    uses: ./.github/workflows/build.yml
     steps:
+      - uses: ./.github/workflows/build.yml
       - name: Test formatting with isort and black
         run: |
           poetry run isort --check ossrfc/