!fixup Add package caching for CI

api/Dockerfile

-ARG PIP_CACHE_DIR
-
 # Can be "development" or "production"
 ARG ENV_TYPE
 ARG GIT_COMMIT_SHA
 FROM registry.git.fsmpi.rwth-aachen.de/videoag/backend/${ENV_TYPE}_common_py:${GIT_COMMIT_SHA}
 
+ARG PIP_CACHE_DIR
+RUN echo ${PIP_CACHE_DIR}
+
 ENV VIDEOAG_API_GIT_COMMIT_HASH $GIT_COMMIT_SHA
 
 COPY extra_requirements.txt ./

common_py/Dockerfile

-ARG PIP_CACHE_DIR
-
 FROM python:3.12
 
+ARG PIP_CACHE_DIR
+
 WORKDIR /code
 
 RUN mkdir -p /code

generate_ci_pipeline.py

@@ -92,6 +92,8 @@ echo "{\\"auths\\":{\\"$CI_REGISTRY\\":{\\"username\\":\\"$CI_REGISTRY_USER\\",\
             f"--destination=$CI_REGISTRY_IMAGE/{self.versioned_full_name()}",
             f"--build-arg=GIT_COMMIT_SHA={self.context.commit_sha}",
             f"--build-arg=ENV_TYPE={self.context.env_type()}",
+            
+            # See https://github.com/GoogleContainerTools/kaniko/issues/969#issuecomment-2160910028
             f"--build-arg=PIP_CACHE_DIR=$CI_PROJECT_DIR/.cache/pip",
             f"--cache=true",
         ]

job_controller/Dockerfile

-ARG PIP_CACHE_DIR
-
 # Can be "development" or "production"
 ARG ENV_TYPE
 ARG GIT_COMMIT_SHA
 FROM registry.git.fsmpi.rwth-aachen.de/videoag/backend/${ENV_TYPE}_common_py:${GIT_COMMIT_SHA}
 
+ARG PIP_CACHE_DIR
 # Empty by default
 ARG GIT_COMMIT_TAG=