Add selective linting to linting workflow (#75)

.github/workflows/workflow-linter.yml

@@ -13,10 +13,20 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
 
-      - name: Checkout Version Branch
-        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
+      - name: Checkout Branch
+        uses: actions/checkout@e2f20e631ae6d7dd3b768f56a5d2af784dd54791
+        with:
+          fetch-depth: 0
+
+      - name: Get changed workflows
+        id: changed-workflows
+        run: |
+          MODIFIED_WORKFLOWS=$(git diff --name-only origin/${{ github.base_ref	}} | grep -E '.github/workflows/.*.yml' | tr '\n' ' ')
+          echo "::set-output name=modified-workflows::$MODIFIED_WORKFLOWS"
 
       - name: Workflow Lint
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        uses: bitwarden/gh-actions/lint-workflow@01cfa748cfdd4983ee7fd134f1f04127a11d907b
+        uses: bitwarden/gh-actions/lint-workflow@1d934d9ae0adc1d230e00e320c987986467b6498
+        with:
+          workflows: ${{ steps.changed-workflows.outputs.modified-workflows }}

lint-workflow/action.yml

@@ -7,12 +7,26 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - run: pip install --user yamllint
+    - name: Install dependencies
+      run: pip install --user yamllint
       shell: bash
-    - run: python ${{ github.action_path }}/lint.py "${{ inputs.workflows }}"
+
+    - name: Setup
+      id: setup 
+      run: |
+        FORMAT_PATH=$(echo ${{ inputs.workflows }} | sed 's/ *$//')
+        echo "::set-output name=path::$FORMAT_PATH"
       shell: bash
-    - run: |
-        TRIM_PATH=$(echo ${{ inputs.workflows }} | tr '\n' ' ')
-        yamllint -f colored -c ${{ github.action_path }}/.yamllint.yml $TRIM_PATH
+
+    - name: Python lint
+      run: python ${{ github.action_path }}/lint.py "${{ steps.setup.outputs.path }}"
+      shell: bash
+
+    - name: YAML lint
+      run: |
+        WORKFLOWS=($(echo "${{ steps.setup.outputs.path }}" | tr ' ' '\n'))
+        for WORKFLOW in "${WORKFLOWS[@]}"; do
+          yamllint -f colored -c ${{ github.action_path }}/.yamllint.yml $WORKFLOW
+        done
       shell: bash
       working-directory: ${{ github.workspace }}