Setting a release tag/commit during sentry initialization

it could be done either with :

• the arg "release" when calling sentry_sdk.init() method
• Setting an env variable SENTRY_RELEASE -> seems to be the way to go

After, determine if we still need the sentry-release gitlab job. If not clean up :

• ci variables on gricad
• sentry auth tokens on sentry.io

Finally : determine the best way to include this env variable without degrading docker image build times