Try to fix chapter 10 deployment example (#429)

Author: FantasyTeddy

deployments/playbooks/deploy.yml

@@ -9,6 +9,12 @@
     - geerlingguy.passenger
 
   tasks:
+    - name: Allow Git invocations in repositories owned by other users.
+      git_config:
+        name: safe.directory
+        scope: global
+        value: '*'
+
     - name: Ensure demo application is at correct release.
       git:
         repo: https://github.com/geerlingguy/demo-rails-app.git
@@ -18,8 +24,6 @@
         force: true
       register: app_updated
       notify: restart nginx
-      become: true
-      become_user: "{{ app_user }}"
 
     - name: Ensure secrets file is present.
       template:

deployments/playbooks/provision.yml

@@ -19,11 +19,3 @@
           - libreadline-dev
           - tzdata
         state: present
-
-    - name: Ensure app directory exists and is writeable.
-      file:
-        path: "{{ app_directory }}"
-        state: directory
-        owner: "{{ app_user }}"
-        group: "{{ app_user }}"
-        mode: 0755

deployments/playbooks/vars.yml

@@ -18,8 +18,14 @@ passenger_ruby: /usr/local/bin/ruby
 
 # Variables for Ruby installation.
 ruby_install_from_source: true
-ruby_download_url: https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.6.tar.gz
-ruby_version: 2.7.6
+ruby_download_url: https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0.tar.gz
+ruby_version: 2.6.0
+ruby_install_bundler: false
+ruby_install_gems:
+  - name: bundler
+    version: 2.1.4
+    user_install: false
+ruby_install_gems_user: root
 
 # Variables for Node.js installation.
 nodejs_install_npm_user: root