Try fixing doc deploy again (#173)

ci/azure-deploy-docs.yml

@@ -21,13 +21,13 @@ jobs:
   - script: |
       set -e
 
+      git --version
       ls -la
       git init
       git config user.name 'Deployment Bot (from Azure Pipelines)'
       git config user.email 'deploy@tower-rs.com'
-      echo 'machine github.com' > ~/.netrc
-      echo 'login carllerche' >> ~/.netrc
-      echo 'password $(GITHUB_TOKEN)' >> ~/.netrc
+      git config --global credential.helper 'store --file ~/.my-credentials'
+      printf "protocol=https\nhost=github.com\nusername=carllerche\npassword=%s\n\n" "$GITHUB_TOKEN" | git credential-store --file ~/.my-credentials store
       git remote add origin https://github.com/tower-rs/tower
       git checkout -b gh-pages
       git add .