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

roles/bat/tasks/deb.yaml

@@ -2,6 +2,7 @@
 - name: get latest github release
   uri:
     url: https://api.github.com/repos/sharkdp/bat/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - set_fact:

roles/fonts/tasks/Linux.yaml

@@ -17,6 +17,7 @@
 - name: get latest release
   uri:
     url: https://api.github.com/repos/ryanoasis/nerd-fonts/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - set_fact:

roles/git/tasks/Windows-installer.yaml

@@ -2,6 +2,7 @@
 - name: get json containing all releases
   win_uri:
     url: 'https://api.github.com/repos/git-for-windows/git/releases/tags/v{{git_version}}.windows.1'
+    headers: '{{github_auth_headers}}'
     return_content: true
   register: git_release
 

roles/jp/tasks/Darwin.yaml

@@ -2,6 +2,7 @@
 - name: get latest github release
   uri:
     url: https://api.github.com/repos/jmespath/jp/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - set_fact:

roles/jp/tasks/RedHat.yaml

@@ -19,6 +19,7 @@
 - name: get latest release
   uri:
     url: 'https://api.github.com/repos/jmespath/jp/releases/latest'
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - name: determine if jp needs installed

roles/llvm/tasks/Ubuntu.yaml

@@ -2,6 +2,7 @@
 - name: get latest stable github release
   uri:
     url: https://api.github.com/repos/llvm/llvm-project/releases/latest
+    headers: '{{github_auth_headers}}'
   register: llvm_latest
 
 - name: read /etc/os-release

roles/neovim/tasks/Debian.yaml

@@ -40,6 +40,7 @@
 - name: get latest version
   uri:
     url: https://api.github.com/repos/neovim/neovim/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - set_fact:

roles/xremap/tasks/main.yaml

@@ -30,6 +30,7 @@
 - name: get latest release
   uri:
     url: https://api.github.com/repos/k0kubun/xremap/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - name: determine if install needed

roles/yq/tasks/Debian.yaml

@@ -2,6 +2,7 @@
 - name: get latest github release
   uri:
     url: https://api.github.com/repos/mikefarah/yq/releases/latest
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - set_fact:

roles/yq/tasks/RedHat.yaml

@@ -19,6 +19,7 @@
 - name: get latest release
   uri:
     url: 'https://api.github.com/repos/mikefarah/yq/releases/latest'
+    headers: '{{github_auth_headers}}'
   register: latest
 
 - name: determine if yq needs installed