Modifying configuration file to generate documentation for engine library

.gitlab-ci.yml

@@ -28,8 +28,17 @@ doxygen:
   before_script:
     - apk update && apk --no-cache add git doxygen graphviz ttf-freefont texmf-dist texmf-dist-latexextra texlive texlive-dvi
   script:
-    - git clone -b feature-aircraftGeometry2 --recurse-submodules https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/libraries
-    - cd libraries/aircraftGeometry2/doc/ && ( cat Doxyfile ; echo "OUTPUT_DIRECTORY = $CI_PROJECT_DIR/docs/documentation/" ) | doxygen -
+    # Clone the UNICADO library repository once
+    - git clone --recurse-submodules https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/libraries
+    - cd libraries
+    # Generate documentation for the feature-aircraftGeometry2 branch
+    - git checkout feature-aircraftGeometry2
+    - git submodule update --init --recursive
+    - cd aircraftGeometry2/doc/ && ( cat Doxyfile ; echo "OUTPUT_DIRECTORY = $CI_PROJECT_DIR/docs/documentation/feature-aircraftGeometry2" ) | doxygen -
+    # Generate documentation for the feature-engine branch
+    - git checkout feature-engine
+    - git submodule update --init --recursive
+    - cd engine/doc/ && ( cat Doxyfile ; echo "OUTPUT_DIRECTORY = $CI_PROJECT_DIR/docs/documentation/feature-engine" ) | doxygen -
   artifacts:
     paths:
       - $CI_PROJECT_DIR/docs/documentation