feat: add new reusable workflow, _build.yml #20

Job	Run time
should_package	4s
package-release	3h 55m 48s
build	32s
package-head (dynamic)	3h 10m 0s
package-head (static)	3h 32m 4s
packaging_done	3s
check_framework_firestore_symbols	5m 36s
Messaging / static / quickstart_framework	6m 25s
Crashlytics / static / quickstart_framework	2m 18s
Authentication / static / quickstart_framework	6m 16s
Config / static / quickstart_framework	5m 41s
Firestore / static / quickstart_framework	10m 36s
FirebaseAI / static / quickstart_framework	7m 0s
ABTesting / static / quickstart_framework	2m 55s
Storage / dynamic / quickstart_framework	6m 9s
Crashlytics / dynamic / quickstart_framework	7m 7s
Database / static / quickstart_framework	6m 11s
Storage / static / quickstart_framework	2m 37s
InAppMessaging / dynamic / quickstart_framework	5m 19s
Config / dynamic / quickstart_framework	3m 20s
Database / dynamic / quickstart_framework	7m 33s
Firestore / dynamic / quickstart_framework	9m 32s
FirebaseAI / dynamic / quickstart_framework	3m 19s
InAppMessaging / static / quickstart_framework	2m 23s
Authentication / dynamic / quickstart_framework	4m 25s
ABTesting / dynamic / quickstart_framework	2m 23s
Messaging / dynamic / quickstart_framework	2m 8s
	12h 27m 44s

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