[BUGFIX] Use composer2.0.8 in base image to avoid PHP8 fatals

.gitlab-ci.yml

@@ -22,7 +22,7 @@ cache:
 # Runs tests, currently it runs phpstan + php-cs-fixer
 code-analysis:php:
   stage: lint
-  image: composer:2
+  image: composer:2.0.8
   before_script:
     - composer install --ignore-platform-reqs $composer_options
   script:
@@ -33,7 +33,7 @@ code-analysis:php:
 # Builds the artifacts for the production system (composer first)
 build:php:
   stage: build
-  image: composer:2
+  image: composer:2.0.8
   script:
     - composer install --no-dev -o -a --ignore-platform-reqs $composer_options
   artifacts:
@@ -74,7 +74,7 @@ build:php:
 # rsyncs the artifacts to the target server via deployer
 .deploy: &deploy
   <<: *prepare-ssh
-  image: composer:2
+  image: composer:2.0.8
   variables:
     # no git needed, only the artifacts are required
     GIT_STRATEGY: none
@@ -125,7 +125,7 @@ deploy:staging:
 # Download database and fileadmin
 Get dump for Content Master:
   <<: *prepare-ssh
-  image: composer:2
+  image: composer:2.0.8
   when: manual
   stage: maintenance
   script: