Add Digi15U1/2021.06 with UT encoding workaround

A Boole stack that contains the UT encoding workaround. See lhcb/Boole#4 (closed)

Release checklist (to be filled by the shifter)

• release build validation
• RPMs deployment
• CVMFS installation
• web pages update

added 1 commit

• 11c0bee4 - Add Digi15U1/2021.06 with UT encoding workaround

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resolved all threads

marked the checklist item release build validation as completed

marked the checklist item RPMs deployment as completed

marked the checklist item CVMFS installation as completed

marked the checklist item web pages update as completed

mentioned in commit 3434b1ab

merged

mentioned in issue lhcb/Boole#4 (closed)