add branch to staging

.drone.yml

     image: debian:stretch
     commands:
       - mv content/_meta-staging.md content/_meta.md
+      - sed -i s/{0xDEADBEEF}/$(git rev-parse --short HEAD)/g content/_meta.md
       - mv config/config-staging.yml config/config.yml
     when:
       branch: staging

content/_meta-staging.md

 Slogan: "Eisiger Wind trägt mein Lied über's Feld"
 Copyright: "Karathan"
 Branch: "staging"
+Commit: "{0xDEADBEEF}"
 ---

content/_meta.md

 Slogan: "Eisiger Wind trägt mein Lied über's Feld"
 Copyright: "Karathan"
 Branch: "dev"
+Commit: "{0xDEADBEEF}"
 ---

themes/stellar/article.twig

 						<p>{{pages._meta.meta.Slogan}}
 						{% if pages._meta.meta.Branch %}
 							<br />
-							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}}
+							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}} 
+							{% if pages._meta.meta.Commit %}
+							- {{pages._meta.meta.Commit}} 
+							{% endif %}
 						{% endif %}
 						</p>
 					</header>

themes/stellar/generic.twig

 						<p>{{pages._meta.meta.Slogan}}
 						{% if pages._meta.meta.Branch %}
 							<br />
-							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}}
+							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}} 
+							{% if pages._meta.meta.Commit %}
+							- {{pages._meta.meta.Commit}} 
+							{% endif %}
 						{% endif %}
 						</p>
 					</header>

themes/stellar/index.twig

 						<p>{{pages._meta.meta.Slogan}}
 						{% if pages._meta.meta.Branch %}
 							<br />
-							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}}
+							<span class="icon fa-code-fork"></span> {{pages._meta.meta.Branch}} 
+							{% if pages._meta.meta.Commit %}
+							- {{pages._meta.meta.Commit}} 
+							{% endif %}
 						{% endif %}
 						</p>
 					</header>