Merge branch 'ci-dev' into 'main'

OS-specific apt CI caches and pip CI caches

See merge request !487

.gitlab-ci.yml

@@ -7,20 +7,29 @@ stages:
 
 .bootstrap-axii:
   cache:
-    key: general-apt-cache
-    paths:
-      - .apt
+    - key: general-pip-cache
+      paths:
+        - .pip
+    - key: general-apt-cache
+      paths:
+        - .apt
 
   before_script:
     - export LC_ALL=C.UTF-8
     - export LANG=C.UTF-8
+    - source /etc/os-release
+
+    # Pip cache configuration.
+    - export PIP_CACHE_DIR="$CI_PROJECT_DIR/.pip"
+    - mkdir -p ".pip" || true
 
     # Apt cache configuration.
     - rm -rf /var/cache/apt/archives || true
     - rm -f /etc/apt/apt.conf.d/docker-clean  # Remove docker-clean script to avoid cache deletion.
-    - mkdir .apt || true
-    - ln -s "$CI_PROJECT_DIR/.apt" /var/cache/apt/archives
+    - mkdir -p ".apt/$VERSION_CODENAME" || true
+    - ln -s "$CI_PROJECT_DIR/.apt/$VERSION_CODENAME" /var/cache/apt/archives
 
+    # Apt preparation.
     - apt-get update -y
     - apt-get install sudo -y