manibuilder/alpine: Add official multi-arch tags for 3.15, 3.16 and 3.17

Change-Id: Ib587f5f0e1e21b662265b9cf17b982fc2daf5e1c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73434
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/manibuilder/Makefile.targets b/util/manibuilder/Makefile.targets
index 9b57a64..333c567 100644
--- a/util/manibuilder/Makefile.targets
+++ b/util/manibuilder/Makefile.targets
@@ -34,6 +34,11 @@
 	  $(foreach v,v3.14 v3.13 v3.12 v3.11 v3.10 v3.9 v3.8 v3.7 v3.6, \
 	    alpine\:$(a)-$(v))) \
 
+OFFICIAL_TAGS := \
+	$(foreach a,ppc64le s390x arm64v8 arm32v7 arm32v6 amd64 i386, \
+	  $(foreach v,3.17 3.16 3.15, \
+	    $(a)/alpine\:$(v))) \
+
 OTHER_TAGS := djgpp\:6.1.0
 
 ALL_TAGS := $(ANITA_TAGS) $(MULTIARCH_TAGS) $(OFFICIAL_TAGS) $(OTHER_TAGS)