Add optional GitHub API authentication headers

If the `GITHUB_TOKEN` is defined in the Ansible controller's
environment it is used to set the GitHub REST API authentication header.
This is they passed to all `uri` modules tasks which interact with the
GitHub REST API. If the `GITHUB_TOKEN` is not set, the authentication
header is not used.

Fixes #19

playbooks/Linux.yaml

@@ -2,6 +2,10 @@
 - import_playbook: LinuxCLI.yaml
 - import_playbook: UnixGUI.yaml
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: firefox
     - role: kitty

playbooks/LinuxCLI.yaml

@@ -1,5 +1,9 @@
 ---
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: rpmfusion
       when: ansible_os_family == 'RedHat' and ansible_distribution == 'Fedora'

playbooks/UnixCLI.yaml

@@ -1,5 +1,9 @@
 ---
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: sudo
       when: ansible_user_id != "root"

playbooks/UnixGUI.yaml

@@ -1,5 +1,9 @@
 ---
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: flatpak
       when: ansible_os_family != "Darwin"

playbooks/WSL.yaml

@@ -1,5 +1,9 @@
 ---
 - import_playbook: LinuxCLI.yaml
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: wsl

playbooks/Windows.yaml

@@ -1,6 +1,9 @@
 ---
 - hosts: windows
-
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: python
     - role: git

playbooks/macOS.yaml

@@ -5,6 +5,10 @@
     - role: system-info
 - import_playbook: UnixGUI.yaml
 - hosts: localhost
+  vars:
+    github_auth_headers: >-
+      {{ { 'Authorization': 'Bearer ' + lookup('env', 'GITHUB_TOKEN') }
+          if lookup('env', 'GITHUB_TOKEN') else {} }}
   roles:
     - role: mas