Use alpine-asciidoctor:mini docker image

.gitlab-ci.yml

-image: asciidoc
+image: alpine-asciidoctor:mini
 
 stages:
   - documentation
  
 html:
   script:
-    - cd $CI_PROJECT_DIR && asciidoctor pm-contributions.adoc
+    - asciidoctor pm-contributions.adoc
   stage: documentation
   artifacts:
     paths:
@@ -14,7 +14,7 @@ html:
     - docker-images
 pdf:
   script:
-    - cd $CI_PROJECT_DIR && asciidoctor-pdf -a pdf-stylesdir=resources -n -a pdf-style=sfl -a pdf-fontsdir=assets/fonts pm-contributions.adoc
+    - asciidoctor-pdf -a pdf-stylesdir=resources -n -a pdf-style=sfl -a pdf-fontsdir=assets/fonts pm-contributions.adoc
   stage: documentation
   artifacts:
     paths: