Add blank lines to visually group shell command lines

The `run` keys of the steps in the GitHub Actions workflows contain complex shell command lines.

The readability of this code is improved by selectively adding blank lines to separate it visually into logical
groupings.

Author: per1234

.github/workflows/publish-go-nightly-task.yml

@@ -121,6 +121,7 @@ jobs:
           KEYCHAIN_PASSWORD: keychainpassword
         run: |
           echo "${{ secrets.INSTALLER_CERT_MAC_P12 }}" | base64 --decode >"${{ env.INSTALLER_CERT_MAC_PATH }}"
+
           security create-keychain \
             -p "${{ env.KEYCHAIN_PASSWORD }}" \
             "${{ env.KEYCHAIN }}"