ci: skip cypress if no code changes (#12982)

.github/workflows/superset-e2e.yml

@@ -56,47 +56,63 @@ jobs:
           ref: "refs/pull/${{ github.event.number }}/merge"
           persist-credentials: false
           submodules: recursive
+      - name: Check if python or frontend changes are present
+        id: check
+        env:
+          GITHUB_REPO: ${{ github.repository }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        continue-on-error: true
+        run: ./scripts/ci_check_no_file_changes.sh python frontend
       - name: Setup Python
+        if: steps.check.outcome == 'failure'
         uses: actions/setup-python@v2
         with:
           python-version: "3.7"
       - name: OS dependencies
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             apt-get-install
       - name: Install python dependencies
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             pip-upgrade
             pip install -r requirements/testing.txt
       - name: Setup postgres
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             setup-postgres
       - name: Import test data
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             testdata
       - name: Install npm dependencies
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             npm-install
       - name: Build javascript packages
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             build-instrumented-assets
       - name: Install cypress
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: |
             cypress-install
       - name: Run Cypress
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         env:
           CYPRESS_BROWSER: ${{ matrix.browser }}