Pin dependencies

.gitea/workflows/release/update-composer-lock.yaml

@@ -19,7 +19,7 @@ jobs:
               with:
                 cmd: 'cat composer.lock | jq --raw-output ''.packages[] | select ( .name | contains ("chill-project/chill-bundles")) | .version'''
             - name: run composer update to update composer.lock
-              uses: docker://gitea.champs-libres.be/chill-project/chill-skeleton-basic/base-image:latest
+              uses: docker://gitea.champs-libres.be/chill-project/chill-skeleton-basic/base-image:latest@sha256:d728a939475e465c488056ec8b9c12f31601ea27251aad830499577857b7be94
               with:
                   # this is where we set the command to execute
                   args: composer update --no-install