fix: run workflow only on PR and with cron

.github/workflows/validation.yml

@@ -1,10 +1,9 @@
 name: validation
 
 on:
-  push:
+  pull-request:
   schedule:
-    - cron: '0 0 * * *'
-
+    - cron: "0 0 * * *"
 
 jobs:
   setup:
@@ -13,30 +12,30 @@ jobs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    
+
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 1
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Set up Python 3
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.x"
 
-    - name: Set up Python 3
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'
-
-    - name: Install dependencies
-      run: pip install -r requirements.txt
+      - name: Install dependencies
+        run: pip install -r requirements.txt
 
-    - id: set-matrix
-      run: echo "::set-output name=matrix::$(python -c 'import runner; runner.matrix()')"
+      - id: set-matrix
+        run: echo "::set-output name=matrix::$(python -c 'import runner; runner.matrix()')"
 
-    - name: Cache pip directory
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: ~/.cache/pip
-        key: ${{ github.sha }}
+      - name: Cache pip directory
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: ~/.cache/pip
+          key: ${{ github.sha }}
 
   validate:
     needs: setup
@@ -50,37 +49,37 @@ jobs:
       max-parallel: 1
 
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 1
-
-    - name: Set up Python 3
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Set up Python 3
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.x"
+
+      - name: Restore pip cache directory
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: ~/.cache/pip
+          key: ${{ github.sha }}
 
-    - name: Restore pip cache directory
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: ~/.cache/pip
-        key: ${{ github.sha }}
-
-    - name: Install dependencies
-      run: pip install -r requirements.txt
+      - name: Install dependencies
+        run: pip install -r requirements.txt
 
-    - name: Validate repository
-      run: python -c 'import runner; runner.validate("${{ matrix.gem }}")'
+      - name: Validate repository
+        run: python -c 'import runner; runner.validate("${{ matrix.gem }}")'
 
-    - name: Update branch
-      run: git pull --ff
+      - name: Update branch
+        run: git pull --ff
 
-    - name: Auto-commit results
-      uses: stefanzweifel/[email protected]
-      with:
-        commit_user_name: validation-bot
-        commit_message: update validation results for ${{ matrix.gem }}
-        file_pattern: results/*.json
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Auto-commit results
+        uses: stefanzweifel/[email protected]
+        with:
+          commit_user_name: validation-bot
+          commit_message: update validation results for ${{ matrix.gem }}
+          file_pattern: results/*.json
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}