Protect against div-by-zero (#2319)

* Protect against div-by-zero

* Rewrite

.github/workflows/push-master.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         step: ['build:release', 'docs:release']
     name: ${{ matrix.step }}
-    if: "! contains(github.event.head_commit.message, '[CI Skip]') && github.repository == 'polkadot-js/api'"
+    if: "! startsWith(github.event.head_commit.message, '[CI Skip]') && github.repository == 'polkadot-js/api'"
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
@@ -21,16 +21,13 @@ jobs:
         CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
         GH_PAGES_SRC: build-docs
         GH_PAT: ${{ secrets.GH_PAT }}
-        GH_TOKEN: ${{ secrets.GH_PAT }}
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GH_RELEASE_GITHUB_API_TOKEN: ${{ secrets.GH_PAT }}
         NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
       run: |
         yarn install --immutable | grep -v 'YN0013'
         yarn ${{ matrix.step }}
 
   dummy:
-    name: Dummy
-    if: "contains(github.event.head_commit.message, '[CI Skip]')"
     runs-on: ubuntu-latest
     steps:
     - name: dummy