manibuilder: Replace unmaintained DEFAULT_TAGS list

AFAIR, I've only used the `working' target for flashprog releases
so far. The default became a little stale, so just remove it. For
a quicker test, the `native' target is still around.

Change-Id: I1dad9ce6dcb1ab77e8c174e801f3b9830b33b190
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/275
diff --git a/util/manibuilder/Makefile.targets b/util/manibuilder/Makefile.targets
index b463ba8..8b485fb 100644
--- a/util/manibuilder/Makefile.targets
+++ b/util/manibuilder/Makefile.targets
@@ -70,63 +70,8 @@
 
 NATIVE_TAGS := $(call arch_filter,$(call machine_map,$(shell uname -m)))
 
-# rather arbitrary selection of images that seem to work (focus on amd64)
-DEFAULT_TAGS := \
-	anita\:9.3-amd64 \
-	anita\:9.3-i386 \
-	anita\:8.2-amd64 \
-	anita\:8.2-i386 \
-	djgpp\:6.1.0 \
-	fedora\:30-aarch64 \
-	fedora\:30-x86_64 \
-	fedora\:31-x86_64 \
-	fedora\:32-aarch64 \
-	fedora\:32-x86_64 \
-	fedora\:33-ppc64le \
-	fedora\:33-x86_64 \
-	fedora\:34-aarch64 \
-	fedora\:34-ppc64le \
-	fedora\:34-s390x \
-	fedora\:34-x86_64 \
-	debian-debootstrap\:amd64-buster \
-	debian-debootstrap\:arm64-buster \
-	debian-debootstrap\:armhf-buster \
-	debian-debootstrap\:i386-buster \
-	debian-debootstrap\:mips-buster \
-	debian-debootstrap\:mipsel-buster \
-	debian-debootstrap\:ppc64el-buster \
-	debian-debootstrap\:amd64-bullseye \
-	debian-debootstrap\:armhf-bullseye \
-	debian-debootstrap\:i386-bullseye \
-	debian-debootstrap\:mipsel-bullseye \
-	debian-debootstrap\:ppc64el-bullseye \
-	ubuntu-debootstrap\:amd64-focal \
-	ubuntu-debootstrap\:arm64-focal \
-	ubuntu-debootstrap\:armhf-focal \
-	ubuntu-debootstrap\:ppc64el-focal \
-	ubuntu-debootstrap\:amd64-jammy \
-	ubuntu-debootstrap\:arm64-jammy \
-	ubuntu-debootstrap\:armhf-jammy \
-	ubuntu-debootstrap\:ppc64el-jammy \
-	alpine\:aarch64-v3.9 \
-	alpine\:amd64-v3.9 \
-	alpine\:i386-v3.9 \
-	alpine\:aarch64-v3.10 \
-	alpine\:amd64-v3.10 \
-	alpine\:armhf-v3.10 \
-	alpine\:i386-v3.10 \
-	alpine\:aarch64-v3.10 \
-	alpine\:amd64-v3.10 \
-	alpine\:armhf-v3.10 \
-	alpine\:i386-v3.10 \
-	alpine\:aarch64-v3.12 \
-	alpine\:amd64-v3.12 \
-	alpine\:i386-v3.12 \
-	alpine\:amd64-v3.14 \
-	alpine\:i386-v3.14 \
-
-# also run all native tests by default
-DEFAULT_TAGS += $(filter-out $(DEFAULT_TAGS),$(NATIVE_TAGS))
+# for now, build all working targets by default
+DEFAULT_TAGS := $(WORKING_TAGS)
 
 default: $(DEFAULT_TAGS)