ci: Allow building specific plugin #140

Job	Run time
Build plugins 🏗 / Generate matrix	6s
Build plugins 🏗 / Build access_override 🛠	49s
Build plugins 🏗 / Build audiovisual 🛠	1m 31s
Build plugins 🏗 / Build burotel 🛠	1m 55s
Build plugins 🏗 / Build cern_access 🛠	1m 36s
Build plugins 🏗 / Build conversion 🛠	1m 42s
Build plugins 🏗 / Build cronjobs_cern 🛠	1m 2s
Build plugins 🏗 / Build foundationsync 🛠	57s
Build plugins 🏗 / Build i18n_demo 🛠	55s
Build plugins 🏗 / Build outlook 🛠	48s
Build plugins 🏗 / Build payment_cern 🛠	50s
Build plugins 🏗 / Build ravem 🛠	1m 35s
Build plugins 🏗 / Build room_assistance 🛠	1m 32s
Build plugins 🏗 / Build themes_cern 🛠	1m 50s
Build plugins 🏗 / Build themes_lcagenda 🛠	1m 37s
Build plugins 🏗 / Build vc_assistance 🛠	1m 32s
Bundle wheels 📦	6s
	20m 23s

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